This means everyone you know has an iPhone. That would be unbelieveable for me. iMessage would be great if everyone I knew did. But most people I know don't, most people have Android, and everyone has WhatsApp because it's cross-platform. So as much as I'm no fan of WhatsApp I'm forced to use it most of the time because for most people it's SMS, WhatsApp, Facebook Messenger or trying to convince people to install something else when they'll just say don't you have WhatsApp. I can iMessage some friends (maybe ~1/3rd), but as soon as there's a group chat you can guarantee at least one person is on Android and it's got to be WhatsApp or FB Messenger.