Can't speak for others, of course I use lists, calendars etc. But I look at them when I NEED and CHOOSE to! Similarly with messaging apps. Do I know how many messages/emails etc are waiting? Yes, of course, but all they do is change the counter- no summaries or extracts appear on the screen to interrupt whatever I am doing. I will choose a time when i will deal with/ignore them. NOTHING appears on the lock screen. What I use my phone/tablet for is my business alone.

The most precious resource I have is my attention. So I control how it is used.