some things youre extolling will mean social ostracization. if i tell someone to email me vs whatsapping me with the phone number they already have, you know what will happen? the person will just say it's too much hassle to contact me.
also rules out usecases for people who aren't actually "settled" and have to follow social norms in some areas- actually expecting a girl to contact me via phone or email before the first date, i'd be living in a fantasy land. it just won't happen
If someone is not willing to contact me via classic phone, mail or SMS well... I do not need to be contacted. It's not a matter of social ostracization.
Also IMO it's a lesson I give for free to my contacts because I explain why I do not use such services.
Yes, I have occasionally missed out on things as I don't use Facebook, WhatsApp, etc.
However...
I find that instant messaging enables and promotes poor organisational skills in colleagues. Rather than processing tasks in a timely and professional manner, they have a safety net of being able to send a group message at 23:30 the night before a meeting the next day. I also find that instead of a well planned, concise email, these people will spam colleagues with a string of brain-fart messages until, 60 minutes later, a consensus is reached.
Funnily enough, when there is no option for this, people never have a problem contacting me in a professional way.
also rules out usecases for people who aren't actually "settled" and have to follow social norms in some areas- actually expecting a girl to contact me via phone or email before the first date, i'd be living in a fantasy land. it just won't happen