Also, WebAssembly doesn't have everything JavaScript has. Garbage collection and support for older browsers, for instance. > WASM requires knowing another lang

Also, WebAssembly doesn't have everything JavaScript has. Garbage collection and support for older browsers, for instance. > WASM requires knowing another language and having a compile step, which adds friction and complexity. You can't really replace a language with a bytecode. I'm not sure that requiring a build step is a real problem, for web 'applications' at least. Plenty of JavaScript frameworks use a build step anyway.