How quick and useful is the interface compared to the regular Jellyfin app when playing music?
I currently use the regular client, since I already have it installed for video content.
Set up the regular Nextcloud install, instead of the AIO. The AIO is not required for any of the things you need, so you end up with lots of stuff you are not gonna touch.
I use Nextcloud with:
Calendar
Contacts
Cookbook
Notes
Tasks
Polls
Tasks can work together with the Tasks.org Android client and there are seperate apps for Notes and Cookbook, while Calendar and Contacts can integrate with your mobile apps via DavX5 using CalDav.
If you just need an online office suite, you can go for Collabora Office. It has some nice integrations, collaborative editing etc. Not sure about an iPad app...
If you don't need to access them through a web browser, I would likely suggest SyncThing, like @GravitySpoiled@lemmy.ml did in another comment. Nextcloud would be way overkill for this usecase.
Git would require you to manually commit and pull any changes you make.
They didn't mention what the story is for, so I am free to speculate. Maybe a raspberry pi is all they have available for such tasks.
It could also be for articles or blog posts.
Some good stuff in there. Nice to see that much work, from such a small team.