I've been finding the Logos actions interesting to work with, but it kind of bugs me that one of your slots is basically always going to be devoted to one of "stance" skills because of how potent they are. The low number of uses on said stances is also a problem with how easy it is to die, coupled with the fact you'll have to dump whatever other skill you have equipped if you want to regain your stance.

Getting the higher tier Logos actions themselves is also proving to be troublesome. From what I can tell, enemies that adapt/mutate will drop a "master" logogram instead of one of the basic types, so finding the specific sprites that are capable of either and farming them before you slip out of their level range is really helpful. There should be some kind of voluntary level sync to allow for more convenient sprite farming, because at level cap you're stuck doing 50-55 sprites which might not even able to mutate/adapt on top of being mostly impossible to solo.