I'm no expert, but I've tinkered with prolog in the past and with Clojure's core.logic more recently and in my opinion it's because the part of my problems that

I'm no expert, but I've tinkered with prolog in the past and with Clojure's core.logic more recently and in my opinion it's because the part of my problems that would be a good fit for prolog make up only a small part of the solutions that I write to solve them. For this reason, something like core.logic is much more interesting and useful because it means I can express the part that is well suited to logic/constraint programming in "prolog" and the parts that are not well suited, can be written in another language more suited to those tasks. For example, I can write some code in clojure, that, for example, implements a UI which then calls core.logic to do some processing, which then calls some clojure to pull the logic data from a database. If I wanted to use prolog, I'd have to do something like: (other language -> ffi -> prolog -> ffi -> other language) which is usually too much effort for me to bother.