I've talked with my friend about what does that mean to work as QA. It seems all they do is watching yet vids with kittens and slacking off, and basically they are useless.

But then, it clicked. They are people to blame first if shipped product have bugs.

I wonder if one day, one dev just thought(after getting reprimanded by his boss for bugs in the final product): "hey, I don't need to listen to this, we can hire a guy for that!