Use it if you are confident that you will be able to handle yourself, and when there is no risk for high damage spikes.

One huge benefit for war is that our tank stance is off gcd so we can swap without sacrificing an action and damage, so you should get used to swapping a lot during fights as OT.

Also the only way to protect the group sometimes is to contribute with damage, considering that there are multiple dps checks that must be cleared in several encounters.