I think this sort of shows what I'm getting at. Without plug-ins or extra scripts yarn and npm take the same inputs, and yield the same output. A yarn user can share a prokect with an npm user and neither will know nor care what tool the other is using our how too make the tools talk.

This isn't to knock clojure tooling, which is good, but I don't think lein and boot are drop in replacements for each other like npm and yarn (almost) are.