Problem is that Largesse is much weaker than Divine seal. It's 20% percent for seconds on a 90 cd while Divine Seal was 30% was 15 seconds on a 60 min CD. Divine Seal provided stronger heals and it had higher upkeep with the lower cd. You see that they tried to remedy this by giving cure 1 and cure 2 higher base potencies from 400 to 450 and 650 to 700. Again, it's somewhat negated by the fact that astro diurnal sect gives either a 10% or 15% healing buff. (Depends on which tooltip is right on either the english or japanese versions) so they're both even again. Granted astro loses the heal potency of synastry but they get back with Largesse and both sects give healing buffs (while dinural loses the speed buff). So overall, this is a nerf to the whm.