Why is mp recovery useless?

barrel is a double edged sword, it lets you take no damage but it can fail, but if you try to use it right before getting hit, you will still be hit, so in that case its a bit useless. I use it every time i am moving to lower ascent, becuase it lets me save a few pots getting thru that stretch. and unlike dark sight, i think you get to keep what speed and jump you have already (correct me if wrong)