They did change the Vitality formula for Shadowbringers. I was curious so I took off all my accessories and I noticed I had about 10k less HP than before ShB came out when accessories didn't have Vit. Used to have around 49k, now my level 70 has around 39k. I think the negative effect this had on deep dungeon was unplanned, so hopefully they will correct for it in a later patch.