[illumin8]

> Engineers should do QA

Yes, they should. The vast majority of QA should be automated unit and integration tests.

> QA is unnecessary

This is objectively false. Even if you perform 99.999% of all QA in an automated way, you're still going to miss those edge cases, like the infamous daily kernel panics due to buggy support for external USB-c displays that only real humans testing your product in the real world with 3rd-party devices can find. QA is still extremely important, and when companies like Apple neglect it, they end up shipping buggy and disappointing products.

[Google234]

I’ll take 99.999%. I doubt a normal sized QA team would have caught this bug you mentioned.