The UX community seems to value rather than avoid breaking changes, and it's infuriating. Novelty and surprise are rarely usability virtues.
I guess it's unsurprising that UX designers would want to continue having work to do.
This is not my experience.
The number one complaint I get from non-technical people using computers is "This doesn't look like it used to, I don't know how to do anything anymore."
The most recent change was GTK driven, where the buttons on common-file dialog moved to the top. But, it hit every app at once so the relearn was abrupt but short. And it was only one thing. Not a frustrating batch of a dozen inconsistent half-baked "tweaks"
The same can be said for developers. Few devs can just make arbitrary changes to an application. They take requirements, produce implementations, and go through review and revision.