The ultimate super app is the browser.
The browser is dominant in the west, because we started using the internet with desktop computers, where a website was the ultimate way to reach people.
When mobile started, everyone had to have an app. Surfing the web on mobile at the beginning didn't work that well. At the same time installing apps was a lot easier then on desktop.
In the west, the app model matches the website model. Most popular apps started as websites, later made an app - facebook, youtube ...
In emerging markets, they "skipped" the desktop, started with a smartphone.
Installing apps is still more of a hassle then visiting websites, so a super app makes more sense then a super website.