[stumped]

If I made the effort to properly learn all the moon reader app features for shelves and favourites, I could probably just copy my whole library toner card and import it all., Instead of using cc to get books for reading
Lack of a user manual for moon and lack of a thriving user discussion area for the app features is what holds me back
Then if I set up folder sync pro, which I already own, to mirror my library changes onto that SD card, I would not need CC any more.
There is a lot of sorting and filtering stuff in CC that I never use. For me it is just a convenient "fetch" tool

The one new feature I can think of would not be simple, it would be to interact with apps like moon reader in order to pull annotations, highlights.. and store them outside of the reader app, with a view to eventually sending them back to calibre or onwards to other apps.
It is not simple right now to mark a typo while reading ,then get that marker back to where the copy in calibre library can be fixed.