Desktop crashes, oh there goes all my applikations that I started, gnome can't keep up with switching workspaces[...]

GNOME, found your problem.

I can take screenshots or rebind keys on KDE, all of that without session losing crashes.

All you are describing simply doesn't happen in KDE, and GNOME is notoriously bad at handling crashes, so go complain about GNOME rather than wayland as wayland is clearly not the culprit.