> LLVM is still not very good at emitting optimized WebAssembly bytecode.

Like I said in the other comment, I find it incredibly weird that wasm-opt can still squeeze like 10% better code (as in, both smaller binary and somehow faster code) on top of what LLVM does. And it hasn't changed much within the last 5 years.

And in general, the tooling ecosystem is doing... weirdly. Rust is doing badly yeah, but for example there was also a long stretch of time (I think it's solved now?) when you couldn't pass a .wasm with bulk-memory or other extensions to webpack, as its builtin wasm parser (why was it parsing the binary anyway?) didn't recognize new opcodes.