Has absolutely no sense to do a great move based on how much damage i take.. so tanks can spam them sure? and BLMs have to go close and get hits to use it?

No thanks. 2Hrs skills could ok, and Self combos are better. I like "This thing trigger this other, and if crit, u can reuse it or attack from left and something happens." Not: "Get hits and u can do this or this one"