Earlier quoted context omitted.
Not my sole reason, but since you asked, here I am. I give my children iPhones. I like having certain family controls over what they use, and further controls over what appears in the app store to begin with. I like having a single vendor for all my software purchases, that I can trust to issue refunds and discontinue subscriptions promptly. I spend all day thinking about computers, I don't want to also be my own IT…
Should a parent really get their children iPhones?
Not your kids. Not your business.