That’s the thing with iOS, I feel like it is really built around the user and what the user wants. Less so around what companies want.
Users love the product so it grew it’s enormous userbase to what it is today. Companies have to comply to the restrictions that Apple imposes on them, because they can’t miss out on the userbase as their customer.
As a user I can’t really think of any guidelines that I’d want to be changed or doors to be opened, I feel like it’s mostly non-users or companies requesting them.