- VoiceOver is notoriously non-customizable. It's good enough for blind users, and catastrophic for any motor issues. All of Apple's accessibility is entirely focused over on blind users. Your grandma with the shakes can go fuck herself however.
- VoiceOver is catastrophically unaware of context. I can't count the times it read "Walk fifteen em" instead of Walk 15 meters.
- Apple's solution to accessibility is to not care about their apps and to just make an "accessible" copy.
- Implementing accessibility properly in UIKit/SwiftUI is a kludgey piece of shit where it's extremely common to see people entirely modifying how text is being read, which in an accessibility nightmare and only considers basically blind users.
Source: the software I work on has to be 80%+ accessible, with regular accessibility audits and a panel of various users.