I get your point and I am well aware of the rudeness of looking at your clock during a conversation and how rude that is. However, I am not someone who is constantly getting notifications, and my phone is kept in my front pocket and is generally a pain to stand up and pull out of said pocket. Knowing I dont have to do that and can at least see who is contacting me from my wrist is a minor, yet still net benefit to my life. I am a big fan of everyone taking stock of how their phone habits are affecting their social and professional lives. I personally hate the phone pose where everyone is on autopilot while staring at their phone. I think this is a way to kind of back away from that and maybe avoid the temptation to be stimulated 100% of the time.