Many Electron maintainers are Slack employees. They're contributing upstream more than most other companies that use Electron, especially compared to their size.
I've been using GNOME on Wayland for over 5 years and I can't recall it ever crashing. Hangs and freezes, yes, but not a full crash. I guess the fact that users feel the need to track "crash recovery" as a feature is indicative of KDE's stability.