Choosing a tank class..

[Ayuris]

Yes WAR has the shortest recast on their defensive abilities, but that does not mean IB is disregarded, it's one of the most reliable mitigation tools offered when playing WAR.
This is basically what managing the stacks is about, sometimes you need Inner Beast, other times you don't, sometimes you use it just to be safe.
This all depends on what content you are doing, who you are doing it with, and how well the fight is going. Different circumstances means different adaptations might be necessary.

[SpookyGhost]

This is basically what managing the stacks is about, sometimes you need Inner Beast, other times you don't, sometimes you use it just to be safe.

You actually just never use IB. If you use your stacks for anything in Defiance it's for Unchained to have the extra healing received/health boon until you go back into Deliverance. To be fair there was stack management in 2.0 and in early 3.0 I was personally excited about Deliverance because (at the time) it seemed like another layer to stack management - now you need to decide when you should be in Defiance and when you should be in Deliverance and plan your stacks accordingly! Warrior's gonna be even more fun! But then it turned out Defiance was useless, especially when raids got easier and easier. Then the VIT changes came along and people thought this would mean bosses would do more damage to compensate, but it turns out they do the same damage and there's even less reason to be in Defiance.

Anyway, I'm hoping stack management returns in 4.0, but for now you're basically just a Fell Cleave bot that sometimes presses defensive CDs.

e: Just read Lyth's post and they basically covered what I said, but since the post I'm replying to takes place after that... I feel like maybe you may have misunderstood it so hopefully this helps a bit.