That sentence was right after this paragraph:

> Talking over phone is the most reliable way to announce the party, send reminders and confirmations, and to coordinate during the party. That way, there's no question of "didn't check my messages/email".

Maybe it’s different in India but here in the states, when you tell most people that you’re not coordinating with imessage/sms (or fb messenger or whatsapp), you’ll get blank stares. I’m reminded of this: http://howfuckedismydatabase.com/nosql/fault-tolerance.png