It feels like Apple lacks the institutional vocabulary to even think about fixing old bugs. The way the releases are structured, there’s a “zero bugs” day where all bugs are ceremonially kicked out of the current release, and the level of quality is deemed to be “what we’re shipping with”. On that day, it’s not like the bugs are fixed, they’re just bulk-modified to target “future os release” and that’s that.
Then the planning is made for next years release and they plan for X features, which require Y time and Z engineers, and some mild hand-waving later a schedule is made, and gee would you look at that, there’s no time anywhere for fixing existing bugs. But that’s ok because big rewrite of subsystem is gonna ship next release and it’ll probably make all the bugs invalid, right? Right? Well, it certainly won’t have more bugs, right? Right? Oops…
This seems like it would work if you build a system on solid bedrock, but how often does that really happen? CarPlay, for example, started as a disaster. Unsurprisingly, it has changed a lot but remains one.