My phone is already like that. There are still emails, texts, the browser still exists, the weather, etc.
And even ignoring all of that, taking hands off the keyboard/mouse, picking up a different device, waiting for the notification, opening it up, typing in the code, putting the phone back down, moving back to the keyboard/mouse/monitor… it’s very disruptive to any flow I might hope to have.
Delete instagram, log out and don’t go on YouTube. Delete games.
It’s really not that hard to make your phone a device for communication and not entertainment