I guess I don't get your point, if a user wants to sideload fortnite or facebook, good for them? If an ex-boyfriend has your phone and your password you've probably got bigger issues than whether or not he can click a button to sideload an app.
>I do get the Apple Store one more, but as history has shown, people literally go to the Apple store to get iCloud theft locks removed by impersonating the owner and faking receipts.
I still don't follow your point, what on earth does that have to do with someone being allowed to use their phone how they want? You think someone is going to steal your phone, go to an Apple store and pretend to be you to have sideload enabled, then return the phone to you? I'm not saying it would be impossible for that to happen, but I would say: why would ANYONE go to that trouble? If this is another "well ex-boyfriend" issue you're talking about 1/10th of 1% of all users in existence. I don't think that should be the demographic with which we base all of the decisions on what an iphone can and can't do...