This is a bit of a stretch
, you honestly believe Apple have or demand some measure of the app functionality LOL
If you read their T&C's they are just middle men collecting fee's for the purchase transaction, they take 0 responsibility even in terms of security, data loss etc etc of 3rd party apps
Sure their development kits have rules on navigation and some aesthetics so there is a measure of core standard operations across the board but that is where it ends. They have 0 to do with how good the app is, they just want a slice of the purchase price.
At least with Google you get a brief window to try and refund, with Apple 0, there is no official refund policy only an exception case, if you are lucky, as you contract is with the developer, not Apple.