Locked mobile phones don’t hurt people other than the people who choose to use them. That’s different to for example a gun.
The only reason to ban iPhones is because you know other people like them as they are and you’re in a minority! You want to enforce a minority opinion on others. That’s morally wrong.
I think it's a good question that deserves an answer.
The Apple tax is not advancing anything. It's just a stranglehold on innovation promoted with FUD about how running programs is insecure despite the fact that this isn't applied to desktop/laptop computers.
Or maybe Apple provides a platform that some users and businesses still find it worth paying for.
You're arguing for the government to ban products you don't like when you can just buy something else.
If you’re willing to ban the NFA/legalize probate nuclear weapons we might be able to talk.
In the mean time I suspect you support at least some level of collective restriction, and that means banning companies from selling locked hardware is fair game.