I don't know why this is being downvoted. The situation is more complex than this simple comment, but the sentiment is correct. The reality is that AppKit has

I don't know why this is being downvoted. The situation is more complex than this simple comment, but the sentiment is correct. The reality is that AppKit has had its ups and downs recently. There are obviously people in Apple trying to do their best to patch things up, and there have been some nice improvements because of their efforts, but some really bad bugs have been introduced, only to sit unfixed for years. It's gotten to the point where I dread the yearly OS updates, not because I dread having to update my code, but because I worry what has broken. In my experience, if you don't get your bugs filed within the first week after WWDC, they'll never get fixed, and even if you do, it's a toss-up. But testing your existing code isn't always enough. If you're writing new code to take advantage of some of the new OS features, you can be a month into the beta cycle before you find a bug, and by that point, its too late.