It really depends on your use cases. WeChat fits well in China as it is building a product exactly adding value for China culture and lifestyle there.

You can make utilities payment via WeChat, but I would much prefer to have a platform automate this for me and not part of an IM.

The West has been following the UNIX philosophy of doing 1 thing and does it very well.

Perhaps WeChat is not just an app, but an eco-system. As for UX on strictly IM functionality, I would prefer WhatsApp, FB Messenger, Telegram etc as it is much "lean" and lightweight to use.

I personally don't think WeChat can be successfully replicate their model to everywhere in the world.

However, a lesson to learn for everyone (including WeChat), build local product. Builds product that fits everyone's need accommodating their culture and lifestyle.