I'm not a fan of Brozime's ideas and builds myself, for example the Mesa green shard build is so pointless it hurts, but he's got a point on this one. Every outside source of DR sofar has had hefty requirements attached to it:
Null Star helminth: the frame needs 300% duration for full effect, is inconsistent at best, despises any build with range... which is most frame builds out there AND only works on health
Arcane Double Back: only 75% DR, requires different movements to activate and thus forcing you into a certain way of playing and has really crappy duration
^ Only needing 180% power strength (which is peanuts, considering how many sources of power strength we now have) for an ability that's basically a good Null Star AND a Roar competitor at the same time? Pfft! Please, DE is not gonna do that.
They were already talking about nerfing the values of the Helminth version if the toggle became a thing. I'd much rather have them make it a good ability with very, very high requirements (328% power strength requirement for full strip never stopped Pillage from being popular, lol), then them getting scared and nerf the buffs into the ground.