This option will not work on syncing client and drive client, as you mentionned it.
But editng the shared files will be possible , which is the main lacking feature
Implementing single files sharing is difficult due to the multiple contexts (Clients, Groups, etc.)
These context issues could be adressed by means of restructuring the UI on web and clients.
I understand your arguments, but i think this could also be improved in the future.
For exemple, i posted these feature requests several month ago (not really related…)
