The iPhone is a computer.
There's an old saying; To err is human, to really fuck shit up requires a computer.
While it's nice to integrate EVERYTHING you need into a handy computer that's always in your pocket (it replaces so many individual devices anymore, don't it?), the obvious problem of putting all of one's eggs in one basket remains unchanged from when such cute colloquial sayings like that came to be...long before that iPhone was even a concept.
And once you've put all those eggs in that one basket, er iPhone, you have to realize it's, after all, just a computer...and we all know they NEVER fuck up.
So, you put your entire life an faith into one stupid device that will fuck your ass up when it fails...or you remember the eggs, and you use those quaint dedicated devices that actually work and have a far better "uptime", and you laugh at the tech victims.