I would say that it is about 99% necessary for PUG groups for actual endgame content, such as ex primals, coil, and alexander (both modes!). Chances are, at least 1 or two other DD's in your group are going to be doing very, very suboptimal dps and don't even know it, so the most constructive thing for you do be able to do in a random pug is to make up for it and push yourself to the limits.