Earlier quoted context omitted.
While everything you're saying is correct, Safari is only the biggest competitor to Chrome because Apple is going out of their way to make it hard or even impossible in the case of iOS for developers to develop well-oiled browsers for their OSes. Just wanted to add that, because I'm pissed.
No; it’s because then, the internet would go from 80% Chromium, to 95% Chromium. Allowing alternative browser engines does not mean Firefox gets a footing. It means Chromium gets a footing even on iOS, and we start seeing Electron apps on iOS, with every app bundling their own Chromium renderer. If Apple were forced to allow 3rd party engines on iOS, they might as well shut down WebKit. All hail Blink, the universal…
If Safari was better then Safari would stay #1 on iOS. They shouldn't be allowed force this any more than Microsoft was allowed to force IE.
If 3rd party browsers were allowed we'd have had WebGL2 on iOS 4 years earlier. WebGPU 2 years earlier. WebXR several years earlier (Apple is only adding it now and only for Vision Pro), and many other features.