Where are getUserMedia, MediaRecorder, WebRTC, filesystem, vibration, screen orientation, Service Workers, Web Bluetooth ? What about WebGL 2? I'm sure there are a few more I missed too.
Those are things that are really holding the web browsing experience back on iOS/MacOS, not an extra 20% 3D performance and slightly shinier graphics.
Or why not lift the app store restrictions so that Google/Mozilla can actually ship non-crippled web browsers and implement it all for you?