What I don't get is why they gave WAR (and other tanks) great tools for single target mitigation, healers got even more tools too, like Aquaveil, Exaltation, 2 charges on Benison, ect. All this is fine. I'm not a fan of bland wet noodle toolkits that feel weak.

....but then bosses this expansion deal almost the same damage, or less.

Other games have made it work. WoW Death Knights used to be notorious for ridiculous boss solos and high tank heal, yet healers were constantly busy there. The issue in FF14 is bosses just don't do damage relative to the tools we have.