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This is what's so annoying about Apple: why no Android client? How can you hope to have a communications platform that is so severely constrained? That's why so few here barely even know about Facetime. You can't invest in it because it's so limited.
'hope to'? They don't hope to, it exists. 15-20 million FaceTime calls every day: http://www.macrumors.com/2014/02/28/apple-40-billion-imessag...
So 8% of users try it once per day? I'm wondering how that compares to phone, messages, email, whatsapp, Skype, etc? Very poorly, I'd say.