WebAssembly is not a silver bullet, and is intended for lower level code than I think you expect.

There's little to no interop with the front-end world as we know it (aka the DOM), and any briding to it is still quite expensive. You'd have to re-implement lua's garbage collector in wasm, etc.

wasm is great for high performance data crunching—aka why it's so attractive for 3d engines, games, and the like.

It's less great for developing front end apps; unless you feel like building much of a browser within it.

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It _will_ get to that point, but we've got a while before interop is a realistic thing