Some bugs can share the same priority levels, but one bug with a larger amount of conversation takes longer to fix due to the complexity of the issue. Other times, bugs with a loud conversation can go on without a fix for lengthy amounts of time, as the cost to address it could override the actual benefit.
In terms of player beneficial bugs, I'd like to give an example of an issue that was just discovered that may be fixed in a shorter amount of time than expected. Players can currently hide their weapons/arms, which is leading to some pretty cool content creation. While this bug is benefiting players, it's actually causing issues with memory in the game. The team is investigating the full impact, but things like this could lead to nasty issues the more that players use the bug in public areas. Think error codes, crashes, or other. I admit from a personal side, I'm sad to see the bug needs to be fixed, but a cursory look at the issue indicated a fairly low wake fix...