I agree their priorities seem off. However, I don't think there needs to be any set schedule for things like this. There's no reason to have any self imposed limitations. New content and improvements should be made to the game because they are considered worthwhile additions. Fixing new content or improvements should always be a consideration. If it was worthwhile to add, it should be worthwhile to fix. The issue is when they put off or ignore fixes in favor of adding new content or improvements. Those additions invariably need fixes as well. Put them off too long and whatever balance exists starts to shift in bad ways.