I was poking around in the Japanese forums, and one was talking about getting Samurai to have the most powerful attack to surpass all other job abilities.
How about I expand on that I wonder? Wouldn't it be kind of nice to give all Jobs something like that? It could only maybe be used once in a while, and act like our mini-LBs.
So for bosses you would need to use it appropriately and not waste it because the cooldown will be very long, and Multi-attack heavy hitter moves for Ranged types would be great for those tank pulls getting through areas.
Shaving off percentage I guess it would depend on the content.