It would have a rule set within a rotation. It wouldn't always be utilized the same way as it drastically depends on what kind of threat you are expecting to work with inside a 60 seconds window.
How you use it in regards to attacking a boss for 5 minutes or an add that dies in 20 seconds would be two completely different things.
It's like having a Max damage/High threat rotation and a Normal Damage/Optimal threat rotation, only difference is that the player doesn't decide for the normal damage rotation if they manage the resources effectively. They don't get that feeling of holding back because of the resource system because they can do a Max Damage/ Optimal threat rotation. If they fail to manage the resource correctly, then the penalty will occur somewhere (lower their own dps or pull and cause chaos).