That's what WeChat is already. It's an entire ecosystem with its own mini-apps, payments and community. Many users in China only use WeChat as the OS on top of

That's what WeChat is already. It's an entire ecosystem with its own mini-apps, payments and community. Many users in China only use WeChat as the OS on top of iOS. Apple is still trying to deal with that and doesn't really have a solution, and it only adds to the numerous inconsistent practices with the App Store.