These hotfixes were intentional and we wanted to share more information about the "why" for you all here:
Mana is supposed to matter for healers, and in the case of Holy paladins, that just wasn’t happening. We were seeing raid groups attempting to learn new bosses where the other healers were out of mana while the paladins were still at 90% of mana. We also thought the experience of paladins healing harder heroic dungeons was inconsistent with that of other healers, or our design intent. We thought it was only a matter of time before groups started going out of their way to stack paladins for raids or recruit them for dungeon runs, which of course is not our intent. For this reason, we thought it was important to address this point now rather than sitting on it until a future patch.
The main culprit for the increased paladin efficiency this was Holy Power from Tower of Radiance. We were seeing a strategy develop where paladins would cast Holy Light on a Beaconed tank, and then cast Light of Dawn on the raid (and use very few other spells). This strategy was remarkably successful considering how simple it is. The Holy Power-based heals are supposed to be an important component of the paladin kit, but because Holy Light is designed to be super efficient, the overall strategy was too efficient. The intent of Tower of Radiance was to make directly healing a Beacon of Light target less punitive, but instead it was becoming the only smart way to play. You can still generate Holy Power by using Flash of Light or Divine Light on a Beaconed target, or through a variety of other ways. Remember, overall it isn’t balanced if paladins are just as mana efficient as other healers and have several mana-free spells.
Light of Dawn was adjusted because it was completely eclipsing Word of Glory. We lowered the healing of Word of Glory late in development, but also redesigned Light of Dawn. They had fallen out of sync, and Light of Dawn was just too good.
