Could you expand a little bit on why not? My limited experience with minikanren and core.logic is that non-relational goals from prolog (cuts etc) exist, but are discouraged, and several CLP flavours that provide relational goals with constraints are proposed as alternative (although they are not very exhaustive). You can also project and use normal clojure on grounded variables...

Honest question, I'm trying to learn new things, not trying to sound as an expert!! As I said, limited experience.