Every week, WoW Insider brings you The Light and How to Swing It for holy, protection and retribution paladins. Every Sunday, Chase Christian invites you to discuss the finer side of the paladin class: the holy specialization. Feel free to email me with any questions you want answered, like how to pull off an awesome dive heal, as pictured above.
Blizzard has tried to give holy paladins so many interesting tools. We saw our first absorption effect in our level 80 ability, Sacred Shield. Its potency was limited due to the proc mechanics involved, and once it was limited to a single target, it became just another buff we kept active. The dev team tried giving us not one but two different HoTs. The first was via the old Glyph of Flash of Light, which took our weakest heal and cut its up-front healing in half in exchange for a weak HoT. It simply didn't make sense.
The second HoT we received came from the interaction between Infusion of Light and Sacred Shield, which would put a HoT on our SS target when we used FoL on him. While more powerful than the last iteration, it was still far too weak to make any difference, and its limitation of a single target really made it untenable. Our ability to prevent damage via absorption effects or proactively heal damage via HoTs was basically nil, and holy paladins relied on massive throughput to solve every healing dilemma. It looks like that model hasn't changed today.