I did not work for Apple but this article describes exactly what I was thinking. Apple has very waterfall cycle. Everything is planned year after year to be released for the September event. When the deadline approach teams realized that are behind and they need to overwork. And when people get tired and under pressure, they usually introduce even more bugs. The article also nails the solution: a more Agile workflow.…
You can't delay a new iPhone release because it's imperfect. They make phones to make money, and they are very good at it.