Hm. I'm not sure I understand your question – Finite Incantatem is a Defence spell, not a Healing spell. And Healing spells are not required to clear Conditions, they just have the ability to do so, if successfully cast
Finite Incantatem would only be able to clear a Condition caused by another spell, while Healing spells can clear Conditions caused in other ways (cuts, broken bones, etc)
Does that help at all?