QA is an interesting one because many companies don't separate QA from development and it works pretty well. I think the main reason you can pull this off is because you can "do QA" by writing automated tests, so it still fits into the "builder" style of work that engineers prefer.

If you asked engineers to do a large amount of manual testing, they would either (a) tell you they were and then secretly automate it, (b) simply not do it, or (c) quit.