That is some fine, fine logic you're sporting there. So by giving people a choice in the form of a switch that allows direct app downloads, you're taking away people's choice to, what, not have a choice?
If you want your walled garden experience, just don't flick that switch. You'll get to keep iOS as it is today.
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Yes, I really believe the only constant in the history of the world is change. Apple will fold someday. It may just be sooner rather than later if they double down on their user-hostile policies.