[woolion]

>on the web, javascript is built in

That's not even true except in the sense that the browser will (most likely) run it (well, some subset of it...). Compilation or transpilation of a language are not considered to be "going out of your way", unless you only program in assembly. And even JS-based stacks tend to have some form of compilation step to gather and process 'assets bundles'. So why not use a modern language that has more web-oriented features than JS?