And macOS has been a minority market player for decades. Windows, meanwhile, as the dominant player, objectively has the most and worst exploits in the real world. People live with it, but it absolutely results in real security risks and monetary losses for people that could be eliminated with a more locked down approach.Of course this is what Apple is going to do. It's not that the claims that all their lock-in have no merit, it's that they are highly exaggerated. That's always been the issue. The world gets along just fine on MacOS, but all of a sudden it's an issue on the phone (where coincidentally they just so happen to have billions of dollars on the line from their lock on the garden doors).
That's what Apple is selling: more protection from risk for one of the most popular smartphone OSes out there. Just get Android (a great platform) if you're wanting openness. Apple made iOS great by making it secure. That's their prerogative to develop the OS how they want.