> What’s the alternative. Are you going to mandate what features Apple, or any manufacturer of devices with embedded software, can or cannot implement? Are you going to mandate by law specific features for side loading that all manufacturers have to implement in all devices containing software? What features, who gets to specify them, how will this be enforced?

Well, it has been done for Microsoft, it could be done for Apple: https://en.wikipedia.org/wiki/BrowserChoice.eu

(I'm just stating a fact, not judging whether that is a good or a bad idea.)