I don’t think this is entirely right: there are plenty of languages with similarish mindshare that don’t have this: just building a Haskell project, for example

I don’t think this is entirely right: there are plenty of languages with similarish mindshare that don’t have this: just building a Haskell project, for example, can be a nightmare if they hasn’t been maintained. Scala also has this issue, despite having a similar marketshare as Clojure.