That and as I've learned the reason plant magic is so underutilized is how complex the spells are and just how rare the life affinity is, combine this with the expense of a decent crystal and having to enchant it along with the possibility of the enchantment failing and the crystal being rendered useless, along with the time and knowledge needed to use an affinity means most never find out what affinity they have and even less try unlocking and using them as It's much easier to just use normal spells.