There already exist WeChat equivalents in the West that do "news, media, social media, payments, ordering in restaurants, shopping, messaging", and in fact they even predate WeChat. They're known as Android and iOS.
Or, if you're thinking of more of a walled garden, Facebook is damned close.
don't smartphones in China mostly run Android?
Seems like a weird thing to compare OSs with apps
If uses the point is, if you ask a typical WeChat user to describe what it is, you'll get a similar answer to the android equivalent. From a user point of view, they're comparable.