It seems to me that these things are a big deal if you're doing a lot of JVM interop and not so much if you're primarily using Clojure-native libraries.

Clojure has futures, lambdas, streams, a community-maintained java.time library, core.match, and Clojure records. I'm sure there would be benefits to adopting the newer JVM-native equivalents, but I'm not as sure they're worth the costs.