When I play Paladin i LOVE to have two charges of schiltron/intervene. It greatly help in raid content when you can protect yourself and your co tank on double/share TB. Clemency may be situationnal, but hell, it works fine. Moreover, people love having distinct tools in their kit what feel some jobs more unique, and when one of the biggest complain about the game is the homogeneisation (which is somehow true but necessary IMO).

If trully the PLD need more sustain, the best way to have it is to add another OGCD heal, or, if we didn't want to add something, put some heal on attonement or combo finisher.