Documents and Desktop saving to iCloud - Best Practices?

I dropped Devonthink, which I loved, a couple years after Apple introduced Spotlight and after I started to rely on iOS. I downloaded Evernote and all the iOS text editors recommended by the gurus before ultimately settling on the Notes app for data collection. For a few years my MacBook was used as a music server, a repository for photos, month-end accounting scripts, and access to one application (Reunion) that doesn’t have full iOS or iCloud support. With Apple Music and Photos in iCloud it’s getting harder to justify the MacBook, which now acts as an expensive external hard drive for my iOS devices. When the MacBook was ‘in the shop’ for two weeks this summer I really didn’t miss it. I wonder how long before Apple turns Desktop and Documents into something more like Photos in iCloud and Apple Music, which don’t require a Mac as repository. Perhaps the USB-C connector on the new iPad Pros hints at that future. I hope.