Devouring blades question

So with the new patch vitality damage was added to devouring blades my question is this does it do enough to warrant adding it to a vitality build with say a witch hunter? Not sure whether vitality will be main damage or secondary yet still deciding but yeah want something like that. If so might make a witch hunter if not guess I’ll have to decide between other vitality themed classes.

Maybe it can help you in leveling, for end game is not worth it since its not working on boses/nemesis.

Well I figure the immobilizing effect wouldn’t but wouldn’t the damage hit them? I know with OFF the freeze doesn’t hit enemies but the damage does…That would be my reason for taking it not so much the life leech but another source of vitality damage.