Apple should continue to support users in the same way as in the past (ie: letting users apply the wise technique "when it works, don't update it"). Macs were always very famous for letting users decide when (and whether) to update. If they did it for iPhones and iPads, they would last for more than a decade (just like Macs).
But, of course, Apple wants you to buy a new iOS toy every year, so... mandatory updates for everybody, and if you deny, then tiresome nagging screens until you mistakenly click on the accept button. And, for the sake of justifying this unacceptable behaviour, they make users believe that, by not updating, they made the world unsafer (soon it will be "if you drive your car manually, you harm humankind").