My iPhone used to be a very attention demanding device. It used to buzz, beep, and alert me for all sorts of things, most of which I didn’t need or want to know about. My iPhone was sending me too many notifications.
When I was participating in a meeting, sitting through church, or enjoying a quiet dinner with my wife, my iPhone would distract me about things I didn’t care about. It didn’t bother me just when I was in meetings or otherwise trying to focus on something, though. My phone distracted me when I was shopping at Home Depot buying stuff for my house, or when I was cleaning said house, while I was watching TV, and when I was driving to work. I really didn’t care that someone re-tweeted something I wrote, or that a stock I was watching hit a certain price, or even that I got a few emails in my inbox, but my iPhone alerted me nonetheless.