What this needs is a demo of something that you can't do natively in a browser. Recreating HN is great, but it shows why it's not as good as HTML+CSS (slower, bigger, no native browser features). This sort of project has the potential to really demonstrate the power of WASM and WebGPU, but in something that's not a game.

You say frameworks "inherit the limitations of HTML/CSS", so show something that can be done when you don't have those limits.