I don't know how to respond to what you're saying because I disagree with your premise. Smartphones aren't a problem in this instance, social or personal issues

I don't know how to respond to what you're saying because I disagree with your premise. Smartphones aren't a problem in this instance, social or personal issues, and there are several of them. 1. There's the internal discipline that the employee apparently doesn't have when they keep going to their phone. 2. There's the assumption from management that a person needs to be 100% focused on work and that lapses in focus are a loss of productivity (when in fact, stepping away and walking can be a perfect way to get an idea and move forward). 3. "punching in" and "filling out checklists" especially are management problems if they're required to use the phone for that, since by the premise of the argument phones are bad and should never be used and then they require them. 4. There's the blaming of the tool rather than the user. 5. With the vast multitude of notification management settings that Slack, in particular, provides, including just closing the app, or muting every single thing except @person's, a disciplined person can absolutely limit their Slack usage as necessary; or, speak with a manager about going dark to 'get some work done'.