There's probably some form of Blitz mechanic that either prevents us from cycling the highest damage Blitz action or make it so other actions have a purpose even if they don't hit as hard as the best one. It's possible Masterful blitz has some layers within, but we're just not sure yet since everything's still not fully displayed.

We don't know what Anatman does. At any rate, this change is pretty good to breathe some life into MNK as Masterful Blitz has ways to develop. Even if it doesn't, it can act like BLM's Enochian and be a secondary gauge that gets built on for a third gauge, unlike GL which inevitably hits a hardcap due to GCD skillspeed.