So do phones but most people only use that when there are not other people around. And there are often other people around when we need to compose texts, emails and FB updates.
Ask yourself how that is possible if it has a teeny tiny battery in comparison.
I stress this is if you are using it in isolation from a phone. Paired to a phone via Bluetooth would yield longer life. But if you've got your phone, why would you want to use all of those features on such a small...