Certainly not an over reaction. If an app sends me an uninvited notification then it gets uninstalled and black listed immediately. Even with apps I use regularly, the notifications are blocked most of the day. People undervalue their attention, and phone notifications are trying to steal your attention. Block it all. Even messaging and email apps can be blocked. I'm pretty sure I'm going to check my phone in a maximum of the next 60 min and a message can wait till I'm ready to look at my phone at my convenience.