do u know how helpfull SoL + JoL can be in a boss where ur raid take aoe damage? at this point u dont have aggro problems "at all" and u dont have mana problems "at all". using Soc just for u to do more dps then a warrior? well gz warrior ur doing more dps then me! what about threat? sry dont think so.
using SoL will help u in the damage taken, and every one know that it does. if u had some kind of equipment that reduced the damage taken by 450+ in a 50% change proc..lolz every one would get that..seal of light dont reduce damage but gives u that in heal..use recount and in the end of the raid calculate the heal that u got from it. its help a lot as "passive mitigation"..u take damage but it gives u back 450+ health that was taken by the mob hit whithougt a heal( for a healer) and that'ss for me is mitigation.
my opinion..sry for the speling xD