Correcting issues with File Explorer would in a large part correct the issues with OneDrive.
A lot of the issues I see, pertaining to OneDrive, pertaining to "Tree" & "File/Folder" searches and syncing, actually seem to be more related to File Explorer. I believe the OneDrive Live Office version which has the "Tree" is basically a copy of the File Explorer format. Now when dealing with notifications of "Sync" issues, it sure would be nice to have some viable options to actually correct the issue or issues, I mean like click on options in the system tray. Now it does say click for more information to correct the sync issues, but when you click on it, there really are no quick fixes. Something is missing here.