Whether it's a bug or a modification to requirements I'm still the one who works on it. So "not my problem" doesn't exist in my situation. The distinction matters very much when it comes to prioritizing my work. I'm 100% time on projects and jump from one to the next with no pause between. I'm also the only developer who supports the apps I built. Bugs usually jump to the top of the queue. Management puts a lower priority on requests. In order to not hurt my current "customer", I need to make sure past ones don't try gaming the system by declaring bugs when they're not.