Which is fine, if you have no need of any dependency management (stick everything in script tags and reference globals), your script is going to be made up of only a few individual .js files (every one has to go in the header), and you have no use for JSX or TypeScript.

For most people working on larger projects, though, the advantages of real dependency management (however broken NPM is) and transpiling JSX or TS is worth the compilation, which you get used to.