Basically, along the same vein. I have multiple offices at my house, it would be nice to just have one POWER-horse, that I can use throughout my home when working. Instead of have to use slower-laptops occassionally. I don't understand why this hasn't been solved as a problem before.
Aren't you basically describing mainframes?
I'm doing this with Windows all the time, connecting from laptop my desktop where I have all the apps running. It's pretty usable even with 4G connections.
https://www.howtogeek.com/howto/windows-vista/turn-on-remote...
you can portforward or setup a vpn to make it accessible anywhere in the world.
There are rdc clients for nearly every device out there (android, iphone\pad, raspberrypi, window, mac, etc)
There are people running super long active HDMI or USB extension cables so perhaps that kind of setup paired with HDMI splitters could work. Security is going to be an issue though.