Angular choses TS (well it's optional but so is jsx).

This is also my no.1 pain point with typescript - they focus on the typechecking part only - you want new JS features ? Use custom js transpilers, polyfills, etc. This means setting up custom typings, build system, module loader, etc.

JS land is just a huge mess to put it nicely because of th inherent problem with browser portability but its made much worse by the low barrier to entry community full of noise. I wish Dart had a better JS interop and faster compiler, in theory it solves all of my JS pains (excellent std lib, sane semantics, default package manager, modules from start, etc.) - in practice it produces big js files, compiling takes forever once you include frameworks, talking to JS is c ffi level of tedious (from what I understand they are working on improving it but its still non trivial with a significant performance overhead)