As a samurai main, i am also disappointed in this lack luster level 80 ability.

I think eventually they'll rework the ability, but it seriously needs one. I doubt they will change it before Shadowbringers go live, and if it does change i will be more than happy to be proven wrong.

Meditating in a fight is difficult, especially in some fights where there is barely any downtime. I know meditate only works in combat, but does this ability only work if you are in combat as well? Like do you need to meditate in combat to start gaining stacks? If not you can meditate before the fight begins to use the ability.

But who knows, maybe someone with more info can say something.