It isn't just about UI design. But the whole software stack as well. iOS is still 90% the same as it was launched, and yet the apps management is still inconvenient to say the least. Along with copying all Android features, if I wanted an Android I would have brought one.
The software stack, how many years has Swift been announced? how many years have they announced Swift UI? Xcode? HN discussed macOS problems not long ago [1]. It would have been far better they just stick to Objective-C for the past 10 years and actually get things done.