This has actually been my experience. When I started with Clojure I was writing it badly. I came from NodeJS world. It even took me a week's time just to setup the working environment.
With time you get to understand the power of simplicity. How to break the problem and compose the solutions to achieve your intended result..
Rapid application technologies, methedologies, or frameworks are not unusual.
I know some wonderfully productive polyglot developers who by their own choice end up at Clojure. It doesn't have to be for everyone.
I wouldn't rule out that Clojure doesn't deserve credit. I wouldn't think it's a good idea to discredit Clojure from not having tried it myself.
I do hope someone with extensive Clojure experience can weigh in on the advantages.
How easy something is a codebase grows is something to really consider.
This product regardless of how it's built is pretty impressive. I'd be open to learning advantages and comparisons without denying it.