> To be clear, I’m still low-key pissed that a crash in my desktop shell, which was deliberately designed as a dynamic-language extensibility free-for-all in the vein of Emacs or TeX, crashes my entire graphical session, also as a result of deliberate design. The combination of those two reasonable decisions is, in fact, moronic. But it didn’t need to be done that way even on Wayland.

This is not a given, though. It's entirely feasible to have a stable "display manager/server" with an extension/plugin system where your WM of choice would sit. Crashing the latter should not bring down the former.