If it's actually on a per-piece or real ECR basis then gear Defense really has no meaning anymore as any given piece would have a static mitigation rate. Think of power cost increases, iirc they go off each single piece too. If it's rounded ECR (the integer value shown in the UI) based then there's at least some wiggle room since the closer you get to the next CR the higher your mitigation gets. Most room is if it's actually soft tier based since then it would be quite close to the old system. I doubt it is though since in all official information there was talk of scaling with CR and nothing of tiers. In any case I think we can agree that the Defense innates still aren't worth it. Not the SP for 20 Defense each and surely not the Power Point for 200.