sand box games like the ones you listed will always ship with bugs as the time required to bug test these games is insane especially the multi platform ones, Imagine having to play through every possible piece of content in something like Oblivion on every platform just to find the bugs then have to fix them and do it again to check if the fix broke anything else the cost would be in the millions and the added dev time would be in the months if not years. these types of games will always have bugs.
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