Wouldn't it be straightforward for Apple to design future iPhones to accept device-targeted updates in order to comply with law enforcement requests like the on

Wouldn't it be straightforward for Apple to design future iPhones to accept device-targeted updates in order to comply with law enforcement requests like the one that started all this? Just add a step: 1) Is this update signed by Apple? 2) Does this update indicate a particular device and if so is this that device? I wouldn't support the government compelling Apple to implement that, but I don't think I'd have a problem with Apple doing it voluntarily. Of course, if it's not a government mandate then anyone who cares (for criminal reasons or otherwise) can just use other devices that don't have the same system in place, so in the end it's just security theater. But at least it might detour some government attempts to overreach and effectively outlaw encryption entirely.