Some places don't allow use of smart phone. They actually ask you check your phone into a coat check type thing at door! One journalist friend often leaves the smart phone at home.
putting all that on a device that you don't control and that "strangers" at apple or google can access or make changes to at any time, and without any notice to you and without any permission from you sounds like a step backwards in security and privacy.
Cabaret at the Kit Kat club in London places a sticker over any camera lens. The Burnt City, an immersive theatrical experience, makes you place your phone in a pouch that is then sealed with a tamper evident fastening before you enter the venue.
It wasn't paranoia it was a healthy dose of "if this is possible, someone is doing it"
Turned out they in fact were doing it.
Everything else is fair game apparently.