Here's my personal canary in the coal mine that something must be fundamentally broken in Apple's software development process: - on a recent macOS version, right click on the desktop, select 'change wallpaper' => the new settings panel opens - click on 'Custom Color' - now hold and drag around the 'color cursor' in the color selection circle for a few seconds - stop dragging and notice how the color cursor continues…
My deep-seated guess is that the switch from a simple language like Objective-C to the complex Swift language with its humongous compile times has caused developer productivity to be broken. No time to fix bugs, no time to refactor, no time to re-iterate on improving features because time is all taken up by compilation and grokking complexity.
The other big time sucks are C++ interop and dozens of micro-dependencies (react-native).