For those of you who think you should be able to install anything you want on ‘your’ iOS device... why do you continue to do business with Apple when you have another choice that does allow you to install anything you want? Really, why are you still in the ecosystem? If you think Android offers you the freedom you desire then move there. I don't get your logic on this matter. It sounds like cognitive dissonance or Stockholm Syndrome. Get help.
There are many possible reasons.
You have a Mac (which, despite the quality going downhill very quickly since Jobs died, still allows you to run the apps you please on the hardware you bought and paid for), the iPhone works better with it. There’s some integration that you just don’t find on the Windows side. You bought a lot of apps and you can’t take their licenses to Android. You need the performance that only Apple’s chips can deliver. You hate that you need a football stadium-sized screen to get a halfway decent performance phone.
Apple is not all bad — admittedly, though, they’re much worse than when Jobs was alive — back then, if you made ****, Jobs would have you fired. With Cook, you can make ****, so long as it’s a penny cheaper, you’re a hero.
Still, they’re completely on the wrong side with their 30% App Store racket scheme though. The real Stockholm Syndrome comes from those that pay a lot extra for their apps and come here to tell us how much they love it.