Paladin rotation at 60 is just weird.
-Three part combo needed to apply DoT.
-Three part combo needed to maintain threat, but using it reduces DPS contribution of the PLD and doesn't help clear DPS checks.
-Three part combo needed if you want to deal max DPS, but will lose threat advantage if you use it continually.
Then on top of that;
-Only spammable AoE (Flash) does no damage.
-Divine Veil requires someone to heal you AND its party effect requires everyone to stack together. Utterly impractical in most situations applying a protective barrier would be useful.
-Shelltron doesn't block magic attacks, including certain physical special attacks you would assume it should (like cyclops swings).
-Sword Oath boosts auto-attack damage in a game whose meta revolves around moving constantly to dodge AoEs, making it a pretty 'meh' ability even when soloing leveling quests. Doesn't help much at all in those situations the tank needs to help kill orbs and crap to prevent a wipe, as it contributes nothing to a DPS burst.
-Spirits Within is weaker if the PLD isn't at full health. Why? Why would you place such a mechanic on a tank whose job it is to take constant damage?
PLD single target DPS might be fine on test dummy NPCs, but the sheer impracticality of all the stars aligning to the degree PLD needs during an actual raid is a whole different matter. Depending on the boss and how much AoE fields I need to dodge, there is a ton of wasted effort trying to do things like apply Savage Blade's DoT.
*If I was to redo PLD I would have made Royal Authority a finisher that can be instantly triggered at the end of a Rage of Halone combo. It would make a lot more sense and fit easier in the rotations.
Also Flash would actually deal damage, Divine Veil would not require shield triggering on heal and would apply its buff to all party members regardless of distance. Spirits Within would lose its damage tied to current HP mechanic, and Sword Oath would add a flat % bonus to all skill damage to assist PLD in those times they need to burst. Shelltron would block the next attack completely.
Finally, Goring Blade would trigger it's DoT without needing to use Riot Blade and Fast Blade.