How to Prevent KDE From Starting
Turns out I could crash ksplashqml quite reliably rendering
my kde setup unusable simply by having a bad XDG_DATA_DIRS
configured in my .zshenv file.
I’m not sure what caused it. But it might be because it was
already set, or that it ended with a :

–
Edit
Actually a bit more looking around and it turns out
it is if XDG_DATA_DIRS contains the same entry twice
it crashes.