What I am curious about is that isn't there a team or group in Apple with a keen eye for UX that are independent of the designing teams, sort of dogfood these c

What I am curious about is that isn't there a team or group in Apple with a keen eye for UX that are independent of the designing teams, sort of dogfood these changes over a period and have the authority to initiate corrections/fixes? Sort of like UX QA but with actual powers?