Don’t know, don’t care; I imagine the answer is Peter & co are car people, not software people. Interviewing for software is hard, and you need someone good at the helm leading the effort. The software team was reworked and this was before Mike Bell, who made the frankly brave decision (because selling “no features for half a year, only internal stability fixes nobody will obviously see” to management is indeed brave) to focus on a full rewrite, not features. It was the right move. A lot of the decisions made early on were ones that would sound good to a fresh college grad, but have absolutely awful consequences that anyone who had worked in industry for a few years would think were obvious. (They were obvious to me, for example, once I learned they were running a VM in the car rather than native software).
Since then, software under him has progressed very very well.
As a result, I’m extremely excited for Gravity and 3.0, because it’s the first version he’ll have had his hands in from the very beginning.