Unchained is actually one of the best skills in Warrior's kit. But as said earlier, it's now trash because it shares a cooldown with Inner Release

If anything, it would be better to completely separate those skills and rework Inner Release into something like "the next 2 gauge-spenders cost half gauge" and reduce its cooldown. That could give us more flexibility with Fell Cleaves and Upheavals during non-zerk windows