Meditate still increases the kenki gauge too.

I think shoha is an ok but not great ability. The thing that makes it not work to me is that the meditation stacks have a 30 second duration. If it was something you could build up over the course of a dungeon or out in the world (not that you get a lot of reasons to meditate while questing) and not worry about it dropping, it would be better. Basically like chakra. This could also be used to add some value to seigan and merciful eyes. Add a meditation charge when you do them, makes it feel better when you get that 3rd eye guard. But instead it's just some free damage during invuln phases, which is ok but not blowing my socks off.