Actually, Gnome-shell _does_ crash from time to time. However, It's impossible to report these crashes as such, due to the heap size being in the area of 4GB, so my core files just aren't written. (abrt and similar also refuse to deal with it)
However, these crashes are easily (auto!) recovered from in a nice way. However they are annoying, it's still impossible (for me) to generate a bug report worthy of actually posting. "gnome-shell went away, things were non-responsive for a while, then the shell came back" isn't a bug report that'd see attention anywhere.