I do agree that developer experience is important, and that Apple should take developer experience more seriously than it does, and that applies across every org in the company. Case in point: the infuriatingly-opaque and mercurial nature of the App Store review process.
The problem is that, percentage-wise, developers are a minuscule portion of Apple's overall userbase. That makes the justification for fixing concerns that are (perceived as) unique to developers difficult when the culture has traditionally leaned toward prioritizing issues with a more obvious impact on the majority of users. I'm not saying this is correct or desirable, just the way things have worked historically.
Given all of that, I think “a browser full of bugs” is relative. I witnessed many instances of bugs being experienced by large numbers of users being fixed extremely quickly. It's always been a function of (obvious, measurable) impact. If a significant percentage of web apps were crashing 60 times a day, those bugs would have been fixed extraordinarily quickly.