Sure the licensing part is very different but the software issue is identical. Browsers are using public APIs which do not support some of the features Safari

Sure the licensing part is very different but the software issue is identical. Browsers are using public APIs which do not support some of the features Safari does. You can't build something as seamless as iCloud because of the private APIs being used there. You can't build an exact copy of the Airpods because the public APIs aren't as good as what they gave to themselves. Watches aren't treated the same if it's an Apple one or one from another vendor. I could continue this list for a long time. The same logic extends to everything in iOS, their software is fundamentally treated differently than the software coming from other vendors and has extra private capabilities.