The main argument for it is that it doesn't do what the talent suggests; while the talent says it can be used outside of Enrage, there's precious
little reason to ever do so.
The problem Fury faces right now is that it has too much to do during too short of an Enrage window. By decoupling Raging Blow entirely (read: always acts as if Enraged), it would actually address this issue, reducing the emphasis on that window by allowing the ability to be used at any time. This would allow it to be used on cooldown, making it rotational as you suggest, and smooth out the Enrage window by removing that factor.
Further, it removes the problem you've unknowingly highlighted:
- If you're simply using it on cooldown after Bloodthirst, regardless of whether or not you're Enraged, a significant portion of those uses are going to be unenraged, wasting some of it's damage potential.
- If you only use it after Rampage during Enrage, you're wasting the cooldown on it.
Neither scenario wins, and this is exactly the
wrong place to be putting your players when creating a rotation. I've spoken at length about intuitiveness and fluidity of rotations, and this is a perfect example of failure in both those areas.