Pfft, I never said that at all. I’m not talking about technical decisions. OP was talking about QC, which is verifying software for human use. If you don’t have user-centered people involved (UX or product or proserve) then you end up with user-hostile decisions like these people made.

How would it not be related? Jamming untested code down the pipe with no way for users to configure when it's deployed and then rendering their machines inoperable is an extremely bad user experience and I would absolutely expect a UX expert to step in to try to avoid that.

Pick any large company that has a division working on Linux kernel (say Android).

I bet my ass UX is not anywhere close to the low-level OS team.

UX is definitely embedded in the App level team but not in low-level.