I've seen a few more people nowadays arguing against Clemency, and I can kinda get why, especially with how much tanks have been encroaching on healing, but I'd argue that it's not Clemency that's the problem, but instead the free heals from Holy Spirit and blades combo.
Clemency typically had a large DPS loss associated; eating into req time/stacks, eating MP that needed to be saved for Holy Spirit, breaking combo, etc. With EW, Holy Spirit cost less MP, so there was room to cast a Clemency or 2 without delaying the next Req window and it stopped interrupting combos. This is where it went from being risky to use and only for emergencies to something that's still emergency focused, but less punishing. Come 6.3 rework, the change in rotation made it even less punishing to use it unless you had to use it during Requiescat. Clemency still has some DPS cost nowadays, it's just not as much as it used to be. Increase the MP cost of divine spells, reduce the amount of MP we restore throughout the rotation and I think it'd be fine.
Holy Spirit and blades on the other hand, that's where it straight up wasn't necessary; Practically 2 uses of Clemency for free every minute with no loss of DPS. Add in Holy Sheltron, and that's another free Clemency every 20s or so. Remove the heals from the rest of Divine spells, and honestly it'd be fine. Holy Sheltron could also be looked at, but that's true of all of the tanks buffed 82 mitigations.