Death by a thousand cuts. First the tech community screamed about memory leaks, so they bolted ARC (automatic resource counting) into Cocoa since unlike C++, Objective-C had no RAII. With swift to be compatible, they forced ARC to all objects. To make RAD (rapid application devolpment), they forced InterfaceBuilder onto the dev community, where artists do layout, but engineers do code. With variable sized screens, RAD tools add constraints to layout, since artists do gui, not engineers. To support Retina displays where GUI is x2, two sets of constraints were added. Spaghetti after twine after hack after crap.

All this goes away if you use a language with RAII, dont treat your devs as morons that cannot manage resources, and allow procedural GUI - let smart dev fix layout and pixels per inch. Artist can create mockup screens in photoshot or after effects, devs do actual procedural coding.

But no, we’ve gone the LEGO assembly way to avoid hiring smart devs.

Disclaimer - I do graphic engines with GUI toolkits for a living.