Yeah, I'm sure it's not because GTA is a massive franchise with a gigantic budget (like this game), of which they actually like to spend some on quality assurance instead of putting it on the market as fast as possible, whether it's done or not. Seriously, you can make every game bug free if you really want to, but too many devs nowadays don't seem to care about that or just don't have the time because of too tight release schedules. You've actually made a pretty good example with GTA5. I didn't really have any noticeable bugs in the game, at least none I remember, and that game was huge. Don't tell me that Skyrim is in any way more complex with all its copy&paste stuff. But thank god Destiny wasn't released on too many consoles. What a buggy mess it would have been.