If you have enough issues, just deduping and knowing when a commit fixes an issue to remember to close it becomes a problem. Not saying this is an excuse, but

If you have enough issues, just deduping and knowing when a commit fixes an issue to remember to close it becomes a problem. Not saying this is an excuse, but it's unfortunate reality that "close most issues, see which ones come back" is one of the easier ways to focus on the most important bugs