Ha ha, interesting.
To this I'd add major color defects that Apple has introduced with their (long, long overdue) ability to select a non-inverse ("dark") color scheme. For example, the segmented control, which is basically a radio button: You never know how it's going to be shaded or whether it'll be legible. Colors you specify in Interface Builder or even code are largely ignored.
The date picker is even worse, for the same reason. I have to programmatically check to see if the user's in "dark" mode and un-hide a light-colored rectangle behind the thing to make it legible. WTF. Apple finally added a method to override the user's color-scheme choice, but it requires iOS 13 or later.
Oh yeah: iOS has no drop-down lists. Apple forces you to use their ever-more-hideous spinner-wheel controls. Again, these largely ignore font and color choices, and require a ridiculous amount to space to make them usable.
Layout constraints are, for a long while at first, a baffling aggravation. They default to stupid things and report incorrect issues. But once you learn what they're really bitching about, you can make them work pretty well. The most valuable thing I learned about layout: Don't position things using hard-coded constants. Always position things in relation to their superview with "center horizontally" and vertically, then offset them with the multiplier. Then line up sibling controls to each other.
You'd think Apple would somehow facilitate gracefully expanding your UI with screen size, but they don't. The above method is really the key to doing so.
Oh, and their amateur-hour hard-coded resolutions for graphic assets, with the hokey @2x, @3x nonsense in the filenames... that's embarrassing. And you can't just use SVGs, like you can on Android.
All the quibbles aside though... I find the iOS development environment pretty damned well-done. And I like Swift a lot. Even Xcode has come a long way since Project Builder. Going back to Visual Studio, which I loved, I now find it suffers from some of the same defects it did in the early '90s and in some ways falls short of Xcode.