If Javascript is the target and the baseline benchmark, I wonder what is the rationale not using Javascript directly? Surely, the Python syntax is not the sole motivation, isn’t it?
… very, very slowly. What language isn’t evolving?
Compare that to something like Lua which is notoriously slow and deliberate with changes.
I tend to think with JS's willingness to adopt any and every hot/contemporary programming trend and it's inability to purge anything (or "break the web"), it's unfortunately destined to age like milk, but I guess time will tell.