In my opinion, you can actually have both an interesting damage kit interaction and also interesting Kardia interactions, the key is interplay within the kit.

Let's say doing damage builds the addersgall gauge, then let's remove stuff like Druochole and Ixochole, instead, let's say the addersgall gauge is now used to augment Kardia in various ways. That creates interplay between doing damage and manipulating Kardia. Now let's say you have a damage spell equivalent in potency to your filler that converts 1 addersgall into an addersting, that then ties the addersgall gauge back into the damage kit.

You can build interactions that tie the whole kit together with some tweaking here and there, if only the dev team had the imagination to make something beautiful again.