And consequently the company needs to continue building its own adapters and SDKs to use existing commercial and open-source solutions (e.g. in data and observability), because Clojure and Datomic are almost never supported out of the box by any tools. That's a cost added that may not always be justified, because anything related to Clojure and/or Datomic is going to require bespoke integrations.

Not to mention that hiring is a problem because the Clojure market is relatively small. But that's not the reason the language never caught on. Perhaps only a reason companies rarely choose it.