With nexe [1][2] and pkg [3] you can now package ClojureScript on Node.js as a static binary, and startup time is now a lot better compared to Clojure on JVM. Go would definitely be better in terms of speed and performance. So it's a tradeoff to make between relative size, performance and having a single language stack, increased team productivity and reduced team overhead.

[1] https://github.com/nexe/nexe

[2] https://clojurescript.org/guides/native-executables

[3] https://github.com/zeit/pkg