As the system is of today - And even will be after the update of T5 spells -, Spririts will remain only to be used for Siphon.

Mala voices the obvious problem here. If the casting time is not reduced AND the magic accuracy enhanced all will be for naught and spirits will remain for decor like a flower in a vase and nothing more.

I personally dont see whats wrong with including them into Rage/Ward cycle like all the other avatars. it would fix at least 1 of the 2 problems above. Then again. Lesson #1 still remains intact: SE is evil. ( only half a joke sadly).