>I’ve still had to work on my self-discipline, so that I don’t spend all my time checking my phone to see what I’ve missed. This is, arguably, the hardest part – the lure of a potential unread message can be profound

Yep, you can either poll, or you can respond to interrupts.

Me, my phone is usually not on DND but it's always on silent. I turn off notifications for everything except messaging apps. Most apps end abusing them sooner or later to send you marketing nonsense, or "you haven't used me in a while, I'm lonely" crap.

I'm amazed anyone can get anything done with noisy/vibratey notifications.