[RivieraKid]

Well, the second paragraph in the article gives you the answer:

> Why: Developers are starting to push WebAssembly beyond the browser, because it provides a fast, scalable, secure way to run the same code across all machines.

It allows you to use the same code both inside and outside of the browser. For example, Figma might use it, they already have a web app and a regular app, both using WebAssembly, so WASI would perhaps simplify their code or allow them to add more native integration to their app.

Making a product that's a slight variation of an existing product is often enough to gain significant market share. For example, was Chrome needed when there was Firefox? Was Figma or Adobe XD needed when there was Sketch? Is Rollup or Parcel needed when there is Webpack and Gulp? This could go forever. I mean, should Java be the only universal deployment platform?