I waited a long time to enter and complete the resonance archive. Waited until I had steel plate armor and stacks of bandages. Ultimately, it didn't matter. With the new healing system, I wasn't able to heal myself at all fighting the final boss. Died 4-5 times, ran back in, picked up myself and just planted myself in front of the boss and hit as many times as I could before being killed again.
Maybe there's a way to beat the boss without using healing, and I'm just bad at finding creative ways to fight. But, to me, the new healing mechanic breaks the final boss fight.