On Android, there isn't one single authoritative app store (since the Play Store isn't available). Therefore every carrier, OEM, major app maker make their own app store (which behaves belligerently to their competitors). The users and app makers get caught in the middle of this messy fight. As a user, you might pick the 'wrong' app store. And developers will never have time to upload every update to 100 app stores, each of which may require slightly different metadata. So the stores clone each other's APK which lead to very slow and irreversible rollouts for devs. In a hyper competitive environment like China, not being able to control exactly when your binaries deploy is a huge, vital vulnerability so it has to be solved.

A super app that brings existing user bases solves both the deployment and discoverability problems.

In China (especially in tier 3,4 cities and rural places) and similar markets alike where many user have low digital literacy, installing apps from App Store is a skill that lots of users don't have. Their first few apps on their phone were most likely installed with someone else's help.

Actually learning every new app is an obstacle, but they managed to learn to a few apps like WeChat because it's super useful. They won't spend time to learn about something that won't bring immediate reward. Once they have a few apps installed on their phone, they'd feel that's enough.

Same thing in India too