It’s not a Facebook service which is an instant plus

You can make and receive FaceTime calls from any recent Apple device to any recent Apple device (e.g. Mac to iPhone) which is nice, but FaceTime’s real advantage is call quality. It’s noticeably more clear and seems to handle poor/unstable connections much better.

I can FaceTime with people halfway around the world with more clarity than I can talk to someone on the same WiFi network using WhatsApp.

FaceTime is basically a verb at this point, and only growing more usable with Mac to phone conversations and 32 ppl simultaneous support

It has a couple of really good use cases as it works on non-phones (macs and ipads). Little kids and some older people don’t have phones. I like the bigger screen for non-casual video calls.

Also, I was on a project with a colleague who had a poor internet connection and we found FT worked better than zoom. FT video quality seems to be the best of the services I’ve used but personally I don’t care about this part much.

I wouldn’t call these “killer features” but they are enough, with the integration into address book etc, to make it flourish.