I know at work I get work around windows taskbar jank at least a few dozens times a day. Granted, I can't do anything about it.
Instead, seemingly trivial bugs exist in huge software products for years. It somehow feels like the people in charge actively avoid dog fooding their own products.
Fixing broken UX is not a priority at Apple any more. They stopped enforcing HIGs for 3rd party apps a long time ago, and their own apps violate many principles that used to matter. Music app on iOS is a great example of slop UI.