I suggest you read the entire thread, as others have provided hypothetical situations in which a boss wipe does not necessarily equate to a full raid wipe. Granted those are hypothetical situations, the Devs would have to account for their possibility when implementing a cooldown reset. Don't get me wrong, I'm all for cooldown reset after a wipe as it's annoying having to wait. But, I'd rather they did it in a way that prevents it being abused instead of just doing it and fixing the abuse after the fact.