I often hear said that everyone makes mistakes; it's how they address them that's more important. That's not going to cut it with Apple. Their initial releases have many bugs. Given the size of their user base, it is likely very hard to fix things by addressing bug reports.
Guesswork follows...
I have no idea how many bug reports they get. I'd imagine it's somewhere between 10 and 1 million per day.
So, even if it's just a few thousand per day, they have to have some automated analysis working through the submissions, trying to isolate the actual issues before they make their way to the first level of human. The bug reports are likely messy, combining different issues or ineffectively describing the problems. Their bug reporting system, even for MacOS related issues, doesn't even require you to enter the version of the operating system. It would be a nightmare to achieve any kind of quality, driving things from this kind of user feedback.
People who phone their bugs into Apple Care aren't really making a dent in this. Tier 1 is unskilled and wastes a ton of the users' time.
I guess the big issues get their attention. Those are the issues in the news or those that have enough careful people submitting correlatable reports. But I suspect none of the issues I encounter fit that bill. An issue affecting only hundreds of people would hardly be noticed by them unless it was in the news.
Apple just has to stop producing C-level work from the start. Apple developers and testers need to be the ones finding the bugs.