How does substituting JS for some other JS achieve a goal of replacing JS? If someone wanted to replace C, would you suggest C as a C replacement? That's nonsensical in context.
Adding browser interop to Wasm that obviated the need for JS would, obviously, achieve that goal. Hence the improvement.
> If someone wanted to replace C, would you suggest C as a C replacement?
If someone wanted to replace C, I would strongly suggest compiling something else to C, yes. That seems kind of obvious. It's how many programming languages that aim to replace C get their start.
To put it another way: I can see how [replacing JS as the interface that the human deals with] can be valuable goal, but why is [replacing JS so completely that it doesn't even exist as generated code] so valuable to you?