I run a Raspberry Pi 4b, recently upgraded from a 3b+, and I believe that a lot of personal computing could (and maybe should) be run on them. They're quiet, energy efficient, and you could probably run them on a battery if you needed it.
I wouldn't run VMs on it, but I do run docker on it, and that works just fine.
I wouldn't run VMs on it, but I do run docker on it, and that works just fine.