We know that some documents are trees; we know that the filesystem is a tree. Our thought processes are perpetually finding what we think is a root, only to find another.
The Desktop is not part of the filesystem. If you save important work 'on your Desktop' you are happy to live in a muddle; and perhaps you can trick someone into taking care of it for you.
On a network we have multiple filesystems; and it is an enticing idea to make this one (distributed) tree.
To do so, however, we will have to give to whom we choose to do the task, the power of motion. For, we do not want to know about synchronization; about one file being in two states.
Therefore, all must stop, until replication has completed.
It's a funny world we live in!