This would allow users to easily synchronise notes between devices. For example, symlink the Notes folder to Nextcloud and then notes would be consistent across platforms.
It’s great that the notes are stored as Markdown files in the filesystem. This approach has several advantages: Users can edit the notes with other tools as well. For example by opening them in with Kate (source mode where MarkNote is only result). Users can use Dolphin to change the folder’s icon and reorganize the folders. Another useful scenario is syncing with SyncThing. This allows me to keep my notes in sync across both my Plasma laptop and my Plasma Mobile phone.