Except everyone uses WhatsApp, because it doesn't have all that stuff - it's just simple. And everyone else is on it. Case in point - Telegram is kinda nice. Has some good features, and it's pretty simple. But I probably wouldn't have it installed, if it wasn't for the one group I need to use it with. Literally everyone else I converse with daily with through WhatsApp. My friends, my colleagues, my relatives, my parents.
Trying to persuade anyone to try something new is hard. Trying to get my parents to use something new, and then trying to explain how to set up an account, what this does, what that does - just not going to happen. Especially if everyone else is using something else.
But good luck to Google, I look forward to giving it a try :-)