[armchairhacker]

I think TypeScript loosely mapping to JS is important if just because JS sourcemaps suck, like they're so often randomly ignored in callstacks etc. And JS semantics are so subtle it makes transpiling any other language a pain.

But this doesn't justify removing every codegen feature. Namespaces and enums won't make your code less reasonable, and moreover they're just syntax sugar, they don't change actual JS semantics.