Excellent observation. Though, arguably the S-100 machines would have taken that niche if not for the PC happening.

Anything without slots or other expansion and interface ports isn't really a computer, it's an appliance, or at best a terminal.

How things are going, I can easily imagine most people using laptops and NUCs, with USB taking the role of Amiga 500's expansion slot, for example.

With traditional towers becoming a niche thing, or back to time-sharing, with browser/cloud infrastructure instead of green phosphor and mainframe.

Nice tip about the S-100 machines, I don't remember them.

It's funny how gamers are probably the people that will keep the general computing revolution alive through the next swing of the pendulum.

And that's despite the high-end games industry doing its damnest to stop it, trying to get people to switch over to consoles. And that's beyond the basic problem that popular AAA games being upper-bounded by the current-at-release console generation holds PC gaming back.