Or allow their bosses to contact them anywhere. Or allow corporations to know their location at all times and use that information for advertising.
There have been tradeoffs to smartphones, and arguably they are worse for individuals than no-smartphone. They increase some convenience which doesn't necessarily translate to a better society or better life for individuals
Take parking for instance. Every parking lot now has an app. So in order to park in many lots you need the app to pay with. But there isn't just one "parking" app, there are parking apps for whoever manages the lot. It's not an improvement at all over just paying at a kiosk, but it means the parking company doesn't have to pay someone to man the kiosk so it's better for them
I'm just saying if you weigh the convenience of your smartphone versus the annoyance, I wouldn't be surprised if the annoyance won a lot of the time. I know it does for me.