I don't think I know anyone who does all of their shopping on facebook, or pays their bills on facebook, or uses facebook messaging exclusively, let alone all of those things. Having the feature list isn't the thing, it's getting people to see the app as their one stop shop for all their technology needs. Just having the feature list doesn't replicate WeChat, I don't know why Elon thinks it's possible to replicate.
News. Media - social and otherwise, payment processing, shipping, messaging.
The restaurant ordering thing is about the only box they don’t check.