> I see it too often e.g., in Clojure, where lib authors even have to add "maintenance disclaimers"

I think this is a peculiarity of Clojure. Clojure is optimized for simplicity and as the saying goes: "It seems that perfection is attained not when there is nothing more to add, but when there is nothing more to remove."

I don't use Clojure these days. Maybe I should revisit the language. It has some really nice ideas.