Why HP inflation is a valid concern

[Rhinos]

From a development perspective (ignoring the accessories stats issues), balancing HP and Atk independently is objectively simpler when Vit is separate from Str in the damage formula. The real issue is gear stats were not adjusted to match the new formula. As long as tank accessories only give Vit(and non-tanks get zero vit), tanks will essentially have HP inflation and Atk deflation relative to non-tank roles with each increase in ilvl.

Tank HP inflation is a valid issue, but less for tanks and more so for non-tanks. Similar to tank str scaling issue, the hp of dps/healers relative to tanks will decrease each new ilvl tier. If the HP disparity becomes too extreme it could lead to issues where non-tanks are so frail they can barely survive a single auto attack if they pull aggro, because the damage is tuned for tank HP. Inversely, tanks could become so bulky that raid damage tuned for non-tanks is so low that tanks could ignore many mechanics.