How often does Apple TV (App) UI get updated?

Im not sure how you feel about ATVs UI but I really like it, more then other services.

HOWEVER: UI of purchased shows is horrendous, and from what I’ve seen it’s been like that for a long time. Do they update UI only when they push out next OS version or?

Is there maybe a way to get it looking like when you search the show normally? I really don’t understand why they would have 2 different UIs for the same thing.