This is true and works for a lot of things (I love the web and publish a lot of web apps). However there is currently a very significant performance penalty bot

This is true and works for a lot of things (I love the web and publish a lot of web apps). However there is currently a very significant performance penalty both due to the available graphics APIs and due to WASM or JS vs native CPU performance. So for games with demanding graphics the web isn't that attractive of a target.