I haven't reported in a while.
My current rules for fixing tags are these.
Typo or full stop I 'Edit tags'. I haven't gotten a complaint yet.
As a general rule if I read a diary and I see a possible problem I check.
If the problematic tag has only been used by one Kog I normally let it fester unless it is obvious to me that it will be used again.
If it has been used by two Kogs I take notice.