Wiki says (though who wrote it?) 'It (wechat) is widely known as one of the world's most innovative and versatile app, as well as China's "App For Everything", with numerous unique functions and platforms ranging from 'payment' to 'social media' to 'services' to 'shopping' and more, that are equivalent to multiple Google Play or App Store's apps, but merged into one.

Is it that impressive vis a vis Western Tech?

Yes. Look at the iPhone for example. All the tech existed before but not in one package. WeChat is the future. Even Facebook are scrambling to copy features now.