[ethbr0]

IMHO, the reason embedded QA works better is because QA is fundamentally a negative task. In that you are telling people they made a mistake.

That's difficult to hear, repeatedly, from the same person. And I've seen a lot of developers not react well to the underlying discomfort.

When it's an external team, at arm's length, that relationship can get pretty bad.

At least when it's someone on your team, then you have non-QA moments and interactions to help balance out the unfortunate bug truth.

And the end result is faster, more thorough, more productive bidirectional communication between QA and coders.