@darius They're easily got rid of:
kevin-custer.com/blog/disablin
And if you really want them to stay gone:
askubuntu.com/questions/125180

Curiously, my systems continue fine: Gnome is picked up from elsewhere. I've had to compile one package from source (ScanTailor) and go back to using fucking-ableist-named-image-editor instead of Glimpse.

Snaps can't access global /tmp, but at least with 20.10 they didn't clutter up df output. Not my problem any more