If you want to use glasses as a monitor replacement, that sort of form factor is one possible outcome. Someone did a PC with that as a display, and IIRC it kinda looked like that.

kagis

Spacetop:

https://www.pcworld.com/article/1919392/spacetop-is-the-first-laptop-without-a-screen.html

Like you, I kind of prefer the idea of separating the keyboard from the rest of the PC if you're doing that. Just use a carrying case/backpack/whatever and plug and take the cables out when setting up. But if you place a premium on setup time and portability, if you're very frequently popping the thing open and shut, I suppose it's not unreasonable. I mean, we could theoretically also have a mini PC plus portable display plus keyboard form factor, and yet, that's much less popular than the laptop form factor.