Lack of QA was the problem, not the sloppy coding

The argument can be made that you can't test in quality. On the other hand, based on speaking with some Apple developers that I know personally, it would seem that automated testing is not encouraged. Neither unit testing, nor a dedicated team of SDETs for many groups. Contrast that to someplace like Microsoft, where I've worked as an SDET and a skilled, dedicated test team for a product is just the way it is.