TB3 makes total sense, it's simply a big step up over the current USB-C - Thunderbolt 3 offers up higher bandwidth that means you can get more done from a single cable. Yes you'd still need a hub if you were to attach everything independently but the point is with TB3 manufacturers can start integrating features into single devices as the Zhenya mentioned. Think of an Apple Thunderbolt Display 2 that provides a hub, a 4/5K display and power to your Macbook all on one cable - you sit down, plug in and you're done.
TB3 also makes external GPU's possible - the razer core external GPU serves this function. You could have an external GPU connected to the hypothetical thunderbolt display 5K (with peripherals and internet connectors etc all attached) all connected to your laptop through a single input. This bridges the performance gap of other devices without compromising the design of the device when travelling.
It's not that it's 'the holy grail', it's that's it's a significant step up over current technology and given we only get one port, getting the best one possible that will improve the way the device integrates with other technology and reduces clutter is going to be in people's interests.
All what you've written does sound good. But do you really think external GPU's is something Apple would do?
Don't get me wrong I use Lumion on my MBP via Bootcamp and the graphics card can just about do that.
Having an actively cooled, external GPU would be a godsend.
However, Apple is Apple and they would never do anything like that.
What people are asking for is very PC sounding.
Maybe a lot of people are 'switchers' and like Apple stuff but don't
get it.
Apple is about making tech stuff just work. Thats the reason all this geeky port stuff is slowly disappearing.
As long as a human being can prod an icon with there face to make magic happen, is all people want at the end of the day. It's where the money is, sadly.
For the rest of the geeky minority, well they can get there kicks from somewhere else.
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This thing is overpriced but I can see this is exactly what many people want. Light, thin, long lasting battery and does all the basic computer stuff (that 90% of people use a computer for). I doubt it stutters on YouTube video.
While light+thin is something that "on-the-go" people want, it also means its not durable. This thing feels as if you can break it like a cracker.
I was surprised though that the iPad Pro is more powerful than this
You have obviously never has to endure the creaky plastic rubbish Windows laptop people have been suffering for years.
The iPad Pro isn't more powerful either. Specs, perhaps. But the software isn't on par at all.
Power at the end of the day with all these tools, comes down to the user.