for me its undebuggability.

-"hey, look at our C Rust FORTRAN to WASM translator, blahblah"

-"uhm, cool, how do I debug it?"

-"yeah...about that...you cant!"

Why can’t you?

This! The only way to get to a stable system at least with c/c++ source, where you can hunt bugs, is to have a fairly large unit test coverage. When something fails - add that as test case; run ctest - pray that this is discoverable with tests.

So wasm is a really strange compilation target for systems programming languages.

I mean there _are_ ways to debug it in a browser but they sort of suck.