WARNING!!! INCOMING WALL OF TEXT!!! Now that I have warned you, please don't hate me or become upset if you hate these. Just skip it and we can both live happily ever after!
I understand what you mean in a sense but the term real gamer in this context tends to put people off as hardware does not define whether somebody is seriously into enjoying video games in some fashion or not. There are all kinds of "real" gamers playing games on all kinds of different hardware. A lot of them even like more than one platform to play games on.
Somebody who is seriously into say, Paradox grand strategy titles is certainly a real gamer but they don't need the PC system you describe at all. Many Macs for example would serve them just fine for that purpose along with all the other uses they have for them.
Anyone who enjoys playing video games in some fashion is a real gamer.
The notion of some sort of fantasy caste system in which there are real gamers, serious gamers and heading down to the bottom of the hierarchy, lowly casuals is silly and has no basis in reality. That whole notion is created by people for their own purposes.
You can certainly be seriously into playing games outside of the definition you provided above. My brother-in-law plays games a lot. He likes the PS4, is a huge Final Fantasy fan and also really likes playing various games on his iPad to relax. One of my nephews very often plays leading AAA titles on his own PS4 while the other one does so on his XBox One. That one does some PC gaming too but not much. All three of those guys are pretty hardcore about gaming and spend a lot of time on it. Not one of them wastes time screwing around working on hardware. They spend less money on hardware too but I've seen them playing on all three options mentioned and they look, sound and play just great. One of them is all about the most recent Need for Speed title lately and the other is lost in Fallout 4. How is there anything not real about that? They don't mess around buying new video cards on some schedule, installing them into a system, installing frequent driver updates to fix bugs. They do not need to waste gaming time on that.
I like console myself. I also like my Mac for the time being but I am losing interest in dealing with the issues and time wasting inherent in desktop computer based gaming when other options free me from that and offer me a better user experience out of the box and long term as well with tons of content including tons of AAA content some of which the PC never sees or if it does see it, the port is awful (Arkham Knight anyone?) and best of all the hardware is substantially less expensive while at the same time offering a longer life. What is not to love? That's plenty real enough for me. It's also plenty real enough for many millions of other "real" gamers.
Remember I told you this years from now: PC gaming as you know it today, Steam and all, is doomed and going away. Desktop computers in the consumer market as you know them now, gaming rigs and all, are going away. Yes, it's going to be years but that is the what the future holds according to my crystal ball and for some reason I've been making accurate calls on stuff like this going back to early MS-DOS and early IBM clone PCs with hercules cards in them. When you step back and look at trends casting aside your own emotions, personal investment in what you like, etc. and look at both historic trends and what is happening around you presently, keeping up on tech news, it's not so hard to see where things are going over time in advance even if nobody can possibly be entirely accurate. People have a tendency to believe what they want to, what works well for them even in the face of evidence to the contrary.
I think Apple does not care a lot about desktop computer gaming not because they are out to lunch, behind the times or whatever in this regard. I think rather it is because they are a forward looking company that leads not follows. I think it is because they already see the writing on the wall and act accordingly. It makes sense for them to pretty much ignore desktop computer gaming in a world where mobile gaming is already the number one money maker out of all forms of gaming. That's reality. Why should Apple invest in tech that is on the way out in the future when they can focus on an important and highly profitable part of what will replace it? Apple has long ceased to be a computer company. They are an electronics company now.
Have you noticed that even genres like strategy and MMOs are making their way to consoles in increasing numbers? I think that in its own way is also telling. So is Steam creating a console with marketing about how they only want to enhance offerings when in reality I think Gabe sees what is coming also and is trying to prepare for that world. Perhaps he will succeed too. We shall see.
Sometimes stuff gets lost in text so please understand I don't mean to sound arrogant or like I think I just know everything. I don't and I know that. I'm well aware this could take longer than I think it will, something unexpected could happen, I might be wrong, etc. but given everything happening today I really believe that what I am saying here will come to pass in the future.
Tablets with keyboards are now starting to compete with notebook computers. Again, these offer great value being less expensive while still offering the primary functionality of a computer and leaving the "serious" gaming to devices built especially for that not that these cannot do some forms of gaming too. It just isn't going to be what we think of as AAA anytime soon if ever. Desktop PC sales have been hurting for years now as consumers move to other options because so many of them do not need an antiquated, expensive, bulky, ugly, stationary computer when modern replacements including even their smart phones for a lot of people give them everything they care about. This affects the personal computer market and as such ultimately will effect the personal computer gaming market. When gaming is the only thing people care about doing on them anymore, the cost of them will be the final nail in the coffin because they just cannot compete with consoles and tablets and various hand held gaming devices. There won't be enough market to sustain them.
You see, earlier on PC gaming had it easier in a world where consumer PCs made more sense for lack of less expensive alternatives and as options for many to do work tasks at home. Increasingly though, this is possible without needing a PC or a Mac. For a growing number of uses a powerful tablet such as the new iPad Pro with an optional keyboard can easily satisfy the computing needs of many for half of what say, a MacBook Air would cost them assuming both are maxed out and have AppleCare. Similar comparisons can easily be made in the PC world and with Windows or Android tablet/smartphone options. I noticed at the Super Bowl there were guys in the media covering the game at a desk using Microsoft's Surface Pros rather than desktops or notebooks. When you see this kind of adoption of new tech happening it is indicative also of where things are going.
Now, none of that computing stuff made much mention of gaming but that is because specialized options at lower costs are what is happening and will I think continue to happen until they become the norm and the way we used to do things and what we use to use to do them with goes away. I think the desktop computer gaming market will gradually shrink until it becomes irrelevant and loses support myself. Again, I think that is exactly what the Steam OS and Steam machines are all about - taking stock of what is already happening and responding to it. The very first introduction of iOS gaming to television with the first simple iteration of this on Apple TV is another sign. The huge popularity of consoles it already nothing new at all. The poor quality of ports to PC with failures like Arkham Knight which got canceled for Macs and I think Linux also altogether is telling. Keep in mind a lot of the PC AAA is console ports. It is interesting how frequently now we see PC gamers using and wanting controller support as well. For these people, the shift to a dedicated console if they don't already use one will be easy. Clearly, they already like using a controller.
Things change. Nothing stays the same. I don't know why people think PC gaming is something that will last forever. Desktop PCs are really crude computers when you think about it in contrast to the ever evolving designs of competing computers. Once upon a time, mini computers by companies like Wang and DEC and Honeywell became very popular and were so modern compared to the huge monsters they replaced. Fast forward to today, PCs are large, ugly boxes that are being replaced. In light of this, I find it hard to believe that gaming on a doomed platform has any real long term future.
In any event, real gamers are people who play games and have fun with them. There is no caste system except for in the imaginations of those who place themselves at the top of this imaginary system. It's a good thing too because if being a real gamer required buying and changing video cards in a metal box on a regular basis, gaming would die off with those metal boxes. That would be terrible. Fortunately, that isn't happening.