Why would you want to support web APIs? They're all just Google proposing 5000 new ways for advertisers to fingerprint you but doing it through "standards".
Nice strawman. The core of webapis is about opening up lower level functionality from the sandbox/accessibility of the web. Beyond audio and video IO, there's great stuff coming with webgpu and webNN. Web apps are much safer and much more convenient than downloading an app, well in theory they could be if support wasn't regularly sabotaged to protect a corporate interest in walled gardens.