While I never had one myself, I remember hearing that Power Mac 9500s were a bear to upgrade. Had to take a boatload of stuff out of the case to access the RAM and whatever. I miss the Blue & White G3s, & Power Mac G4s. Just pull down the side, and there was the motherboard.
The problem I see is there are two very disparate groups of people who want Macs: those who want the super thin, fashionable Macs who don't care about upgradeability and the people who want easy upgradeability & repair, who don't care about fashionable cases. Unfortunately, the former group seems way more common, so Apple seems to want to cater mainly to them.
I doubt that former group actually exists- at least among people with objective minds. I NEVER hear people talking about wanting a new desktop computer and keying around "super thin." I hear them wanting power, compatibility, can run <their key software>, upgradability, etc, but "super thin" and "fashionable" seem to never make it into the conversations.
I think this crowd is created by Apple, meaning knowing that Apple will key on "thinner" makes the Apple fan crowd covet thinner... not so much because they actually want a thinner or fashionable desktop, but because they know that's what they will get from Apple... and they want an
Apple desktop. In other words, instead of Apple listening to a crowd of customers wanting "thinner" & "fashionable" and building for them, I think it's the other way around: Apple is building a "thinner & fashionable" computer and a crowd buys anyway FOR OTHER BENEFITS of Apple hardware.
Look at the headphone jack decision in iPhone. Those happy with bluetooth or lightning connections ALREADY had that with iPhones that also had a headphone jack. Nobody was clamoring for Apple to get rid of the headphone jack before rumors started implying they would do so. Nobody gained ANYTHING when Apple jettisoned it as the bluetooth or lightning connection crowds could already connect that way. Only the headphone jack segment lost something. iPhones without headphone jacks sold like crazy anyway. Did that mean that every buyer wanted rid of the headphone jack? Did Apple do a market research study, discover that iPhone users wanted to get rid of that jack and thus chose to give the market what it wanted?
No, it meant that even the headphone jack users wanted the rest of an iPhone bad enough to try to roll with Apple's decision to kick out that jack. Rather than giving the market what it wanted, Apple was deciding something for the market and leveraging the "whole" to be able to jettison some ubiquitous utility to "create space" for other stuff (and increase average revenue per sale by pushing AirPods + a market for dongles when some need more than the one they included, etc). I think if research was done, people would have chosen a modestly thicker iPhone that keeps the flexibility and creates that "room for other stuff" rather than going the way they want... especially when any such imagined research did not result in the jack getting kicked out of new iPads, new Macs, etc.
Apple seems to be in a mode of building things the way they want and trying to make the market like it the way they've chosen to go. They have the help of a segment of people who hang out here who always argue so very pro Apple no matter what Apple chooses to do (even if it doesn't affect them in any way at all). Because so much of Apple products is still good-to-great, such decisions are generally met with enough "buy anyway" actions to make it seem like Apple knew best yet again... aka "$XXX Billion in the bank can't be wrong" and "but who makes the most profitable ______", etc.
What are the gripes from this very passionate Apple crowd about the iMac Pro beyond price? Primarily, it's lack of upgradeability. What are we dreaming about in this Mac Pro? A very upgradable & keep-up-with-the-times (via upgradabiliy), headless Mac. Is anybody clamoring for a thinner Mac Pro? A thinner iMac Pro? Not that I've seen.
Almost never will you read comments about wanting just about anything Apple makes "thinner" until Apple actually rolls out a "thinner" whatever and then people let on that they wanted it "thinner." For example, gripe about any Apple product "thickness" right now and the apologists or ADF will tear into you for not liking it exactly as Apple has chosen to serve it up now... only to shift with Apple when they make it thinner in the future. That's the way it goes. I don't actually see market demands driving product evolution. Instead it's the other way around (with help of Marketing spin when the evolution is not obviously desirable or even downright taking something very useful away). And then many buy anyway, not to endorse the change but because we want the rest bad enough to endure some changes.
And before someone comes back with the tired Henry Ford quote about faster horses note that he also is quoted as saying "<consumers> can have any color of car as long as it is black." How well did that "I know best" mentality work out over the long run?