40 cut isn't very much in terms of how much pierce or blunt damage is needed to outperform that amount. Nor is it very much when you consider how many times you have to hit someone with loomed plate armor if you only have 40 cut. On the other hand, the alt mode when loomed* does 50% more effective damage to 70 body armor than the cut side does. This makes a huge difference. Even with a "3 or 4" damage buff to the cut side, it still would be less effective than the alt mode on 70 body armor.