So I'm practicing blm and I'm looking at the aoe rotation for 70 which to my knowledge is get umbral hearts, fire 2 x2, triplecast flare x2, convert, flare, and maybe a mana potion, swiftcast, flare if need be.

But then I look at the umbral hearts phase and occasionally I need to pop a blizzard I to keep enochian up. But it seems after thunder II is obtained, Blizzard II and Freeze are pretty much unused. Is there any point in time that these skills are useful or are they just dead slots?