My Oppinion may differ But i see WHM in Stormblood as a very strong healer as it looks now. But the Lilie Mechanic is definitly lacking.
You should Consider adding differnet bonuses from lilies to different Spells.
i.e.
Regen with Lilie = Regen + Tenacity up/direct Hit up
Cure with lilie = Cure + short regen Effect
Cure2 with Lielei = Cure2 + Shield
Medica with Lilie = Medica +regen effect
Medica2 + Lilie = Medica2 + Confession stacks
Raise +Lilie = Raise + arrise(aute Raise on next death)
Assize + Lilie = Assize + Assize Cooldown reduced
Tertagramaton +lillie = Tetragramaton +Tetragramaton Cooldown reduces
Asylum + Lilie = Asylum + damagereduction (like Astros)
And so on you get the idea.
And also how you generate Lilies, you should generate them throu more spells not only Cure and Cure 2.
Also WHM got stripped of essential Skills and has to get them back thour Class actions. wich leaves no room fo new Class action. Please consider leaving some skills native to WHM like Shrouds of saints and Divine Seal and esuna, so we can use the new Class skills as well.
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Confession stacks. Having them only build up throu Cure and Cure 2 is bad. They need to build also throu the other heals like assize medica and the other healing skills.