I think there's a lot of potential for "run an app remotely, draw it locally". A crippled, single-application version of that's an entire, recent, highly-publicized startup, even (the controversial remote-Chrome-as-a-service company that's been posted about quite a bit in the last couple months).

I think it's not widely done because Apple and Microsoft haven't put out good tooling for it. If one of them released that kind of thing as a high-quality, polished feature, I bet it'd be big.

Also, IMO the default set-up and behavior for it on Linux machines isn't very good (shocker, that). Much better would be persistent remote sessions that let you drop your connection on one machine and re-connect on another, and leave them running indefinitely when not connected. You can get that working with some extra software but it's a bit janky and the UX is nerd-only, like most of this stuff.