PLD is a waste on anything other than Titan and Coil.

[Amas]

Simply put it is less effective to heal a Paladin tank as their lower HP results in more overhealing. Warriors on the other hand benefit from the maximum of each classes increased healing ability (their own, the healers, and any additional auras) which then result in far great amounts healed with far less over healing and agro strain on the healers.

Uh... what?

You're cherrypicking your own facts/scenarios to make the picture look rosier, but what you're saying simply isn't true.

There's no reason to overheal a PLD on farm-tier content, as there's nothing capable of spiking them hard enough to worry about keeping HP topped off. A PLD has far more HP than a healer can recover in a single cast, and there's virtually zero risk of death letting a PLD drop low enough to prevent overhealing even on a crit cure spell. More realistically, thanks to the flat damage-taken profile and CDs to cover predictable damage spikes, a healer can pop proactive heals (Regen, Stoneskin, Adloquium, etc.) on a PLD and ignore them for the most part.

There's no reduced efficiency to healing a PLD, and even in Sword Oath they take less damage than a WAR.