Also Gradle breaking the DSL all the time has become such a pain, that eventually they had to create an upgrade wizard, as if debugging performance issues with the build wasn't fun enough.

In my experience, Xcode has been terrible, sometimes borderline unusable. The horrible project format, merging pains when working in a team, interface builder being trash in general but completely unusable when you use a lot of custom components with @IBDesignable properties across multiple modules - in that scenario it sometimes rebuilds everything in an endless loop, and brings even the most powerful Mac machines to their knees.

In that state even changing a simple property on a view takes 15 seconds of 100% cpu time.

Sure nowadays there's SwiftUI but IMO it can't be considered as anything more than an alpha until they fix the horrible navigation woes. And even then it still uses UIKit under the hood and you can see countless internally used constraints breaking all the time in the logs. At least that's how it was when I tried it a year and a half ago.

And that's not even touching on the cruel joke that is the xcodeproj project format.

Apple didn't even provide a package manager until relatively recently for God's sake. It was left to the community (cocoapods) to fend for themselves in this regard.