Windows preloads the entire desktop it seems, before logging in. That is pretty great. Apps starting is the same, just more bloat often. Flatpaks make it more equal though. Firefox does some nice UI-preloading too, and FF on Windows is actually more secure than on Linux ironically.

So there are things to fix, but comparing breaking windows updates to never breaking and way faster immutable rpm-ostree updates, while you use the system normally, its worlds.