In HW certainly, less people single-cast Stoneskin in the middle of a fight, and SS only did 10% Max Health mitigation. In ARR it was totally more of a thing, which I had to learn when I healed even Garuda Ex or Levi Ex (especially on lower HP party members). Back then SS did 20%, and was wonderful to have, even with a Sch's mitigations. That much isn't speculation but actual history; also history were the White Mages who overdid it on casting and replenishing SS, and wondering why they had no MP.
Compare to now when I run something on Whm instead of Sch, and I find myself either sitting on my thumbs until the raid damage is done and over with, or else pre-casting Medica II so the regen will help the Medica or Cure III post major attack.
I'm glad you agree it's all speculation, though, as to how much use Stoneskin would be these days. With my luck, the effect would have been dropped to 5%, which would certainly have been a waste, imo. What I'm saying, however, is that it would be nice to have a fully re-instated stoneskin. Between that and shields from Sch or Ast (in Noct), something like Neo's Almagest would be less heal intensive. Would it be likely to have this again? No. But still nice to think about, and hurts thinking about when enemy mobs, current ones, use it.
