What are all the useful services I can host right on a raspberry pi?
Depends what your needs are I run a mailserver a DNS/pihole and several of my own applications.
All shaved and smooth
Tasty snack!
Stretching a lower resolution to fill the screen under KDE Wayland?
I use valves gamescope for this https://github.com/ValveSoftware/gamescope
Depends what your needs are I run a mailserver a DNS/pihole and several of my own applications.