Another reason might be because there are alot of games releasing lately (I've written an column about it on dutch gaming site), so some dev's choose to delay the games, so they don't release it in the same time as some other competing so they get the most attention, but I doubt that's a big reason, if it's a reason at all, because I do think there are quite alot bugs to be fixed, if you just look at TDU, still full of bugs and glitches that are still not fixed.