Years ago I worked as a game tester in one of Infogrames' QA departments. I worked on a ton of games in my time, and they were all released while there was still a long list of bugs remaining to be fixed. And, in every case, the company was clearly aware of the problems and made a conscious decision to ignore them. I don't know about other types of software, but commercial games absolutely are abandoned rather than finished.
Oh Christ.... remember the Portuguese version of Fatal Racing?!None of the testers even spoke Portuguese and even WE could tell half of the text was missing. They went ahead and released it anyway because another released game would look good for their investors.
Didn't seem to matter that said game was complete dog filth.