Come on, React Native is a thing but as a % of JS engineers, the number that will regularly stray into compiled packages is much smaller than with Python. Basically every time you pick up a Maths or ML project which is a huge part of Python's ecosystem, you'll be using C or Fortran code underneath. That library ecosystem in that are is just non-existent in JS, and where it does people are typically using compile-to-WASM anyway.
Pypi doesn't have any issue distributing binaries either these days? The issue is (a) diversity of CPU/GPU microarchitectures inc. CUDA (b) diversity of OS-es.
I've never had to compile a native Node library on a POWER9 GPU cluster, but I have had to compile Python ones.
And the JS world has ESM modules, CommonJS, various polyfills for compatibility, and other quirks that need to be accommodated by the package manager. With native code compilation affected by these settings.
