Sure, but realistically, that makes no difference when (A) only one browser ever implemented it, and (B) its continued use by its originator company _despite_ deprecation last year (after its team was destaffed two years ago) still stinks of an attempt at lock-in, open source or not.
There are still things you can't do with the web platform alone. WebAssembly is still in its infancy, and not everything is really figured out yet. In this case, it looks like they're held back by the lack of proper threading:
>However, we’re closely tracking the evolution of WebAssembly (especially threading). Stay tuned!
It seems reasonable to get this program out and running today and move it over to WebAssembly in the future. One of the alternatives would've been to deliver a native app to every platform, but Chromium is already a native app that runs on many platforms that you can compile yourself, and then you get a security sandbox for free. Seems a better to me, frankly, especially in a world where many "desktop" apps just ship with Chromium anyways.
