LOL, so you really have no idea how it actually plays.
You are actually burning a def CD for damage still, it just changed to Thrill of War.
Overall on 8 man's you are correct in that you can play off and switch stances planned and not waste BG. But of course that will result in WAR having to do a ton of planning for the timing of the fight, which is a new burden. The dps rotation is pretty strict now, more so then say that of the reworked Dragoon, which is odd for a tank. The real plain is felt in 4 man's that makes the class just not fun to play. It is in that content that not being able to stance change, without pen, hurts the most. That and the time it takes to build gauge. Basically, say you open in Def on a 4 man boss, you build some aggro and some gauge with it. Burn the gauge (likely on a Upheaval and one IB). Stance change. Now build to 100 gauge and release your IR/Zerk, are very high burst phase.... which comes when the boss is sub 50%... meaning you also likely incurred delays along the way in mechs and phase changes/jumps. It just makes WAR so awkward to play, to say the least. When we are overgearing content more, that stance change might come sooner, but aggro management is a big issue when you are not in tank stance, and your rotation no longer includes a aggro combo.
And after having to endure all that, the Pally will still out dps you by 20%.