Suggestion - Private and Shared Notes

This may seem rather odd but I had a random thought about this as I was using a DM to pass a note from my phone to my PC..

Have a notes tab/section where you can write notes (like post it notes) that are shared between devises and that can be shared with others (A bit like evernote or google drive). It is understandable that a DM and that a server channel can be used for that but it tends to get cluttered and hard to find things after a while so a specific notes section would be very helpful.