It dosent work like that everywhere, even in the game market...and where it dosent, those companies tend to eat everbodys lunch (Blizzard, Bioware).
Also, dont think that letting QA be the gatekeeper=zero bugs...but QA is the group that knows when the game has reached a certain level of overall smoothness and, go figure, quality...letting anyone else decide when to ship is just bass ackwards and wrong.
I'm sorry, I couldn't help myself.
Actually, it happens there as well. The difference, as stated in the original post, is Time/Staff/Money. Both of the companies you have stated will make their own decisions regarding Time because they have a lot of Money. So, when you see product from them it is usually fairly polished. That being said, I think I have more submitted bug reports in WoW than I do in STO. Just because they're big doesn't make them perfect, and I have the patch logs to prove it.