Kindly give us performant access to the DOM, pretty-please! WITHOUT any JS glue code.

WASM is called WEB assembly but it can't access the Web API's without paying tax to the JS tyrant in between.

WASM standalone runtimes are mostly fine, but WASM in the browser is not great. No direct access to any web APIs (this often really hurts when shuffling data to/from WebGPU). Multithreading via WebWorkers is a complete pain to setup. No zero-copy APIs for streaming data in/out. Little paper cuts, but they all add up...

Not the previous poster, but immatures: Needing to compile down to one enormous program, with no possible code sharing. The async story is not good.

Wasm components & wasi have a lot of promise here. Until now though browsers have been ignoring all this; Firefox just started taking a more active interest. https://hacks.mozilla.org/2026/02/making-webassembly-a-first...

Memory management is pain. If you want to optimize, you're forced to 4k pages. Runtimes are fragmented. Wasi is a mess. Async and threading is awkward. Whenever you need to integrate with hardware you need platform specific adapters.

In practice, whenever you need more than a singlethreaded app with http/serial port, the "run everywhere" breaks.

Don't get me wrong I love WASM but we're not there yet