[insoluble]

> One way to solve this is to create a modular super-app for which developers can write components

I am pretty sure they call this an operating system. Moreover, most operating systems do provide built-in or pre-installed functionality, such as for scheduling, messenging, and note-taking.

[prmph]

Ok, but most consumers have no stomach to go mucking around with OS components. The modularity of OSs is at too technical a level. And most third-party apps are trying to solve slightly different issues, with lots of overlap in functionality. There are no well-defined, standardized extensibility points are needed

In any case, if I were to write an app for any OS, I still have to think about authentication, UI, storage, etc. There is no tight environment where I can just submit a more performant file sorting algorithm, for example, and be paid by users who choose to use that in the OS. That is the idea.