[r2vcap]

The strength—and also the weakness—lies in how WASM is consumed in the browser. During instantiation, JavaScript engines validate the module and reject it if it uses unsupported instructions or features. In practice, due to browser compatibility differences, WASM modules often need to be built in multiple variants, such as a baseline version, a SIMD version, a SIMD+threads version, and so on. This is a significant pain compared to native binaries, which can rely on runtime feature detection and dynamic dispatch.