Power Stance sucked, Anon. It's 3 extra moves. Two if you don't count the one that's a combo from the first!
Take straight swords for example, a boring double swing to one side, double swing to the other. Then a cooler, but slower and more impractical move for the heavy attack. That's all. Gotthards in 3 has 3 L1s, a rolling L1, a running L1, and a weapon art.
You really have to be an idiot to believe power stance was better just because you could get different skins on your double swords. Only through the bugged tech of quick attacks was power stance worth a damn in that game.
Actual moveset on the left handed weapons was great, but power stance? Utter trash. Literally can't be proved wrong. Pic related.