[Retra]

You could say the same thing about any assembly language though. But they are still important, even if only a few people need to truly master them. The main advantages web assembly should provide are that it be a simpler target for compilers, minimizes overhead for doing so, and that its performance be independent of that of a higher-level-language like javascript.

All the things you want require a standardized, performant web assembly to meaningfully and portably implement.