Comment by ende

This is the classic case of development velocity pitted against operational stability. Entirely different incentives, and when vested into the same role that role is bound to prioritize one incentive over the other. For this reason I think they must be separated at least by body if not by team. They certainly need to separated by different managers.

I tend to think QA is perhaps well situated alongside Ops("DevOps"), and very close to Product + Design.