In Lightroom CC I can only share albums. I like this option, but I need it also for folders. At the moment I export all photos for my clients to Dropbox. They have permission to see specific folder with the folders (albums) for events inside.
Client 1 - Event 1 - Event 2 - Event 3
Client 2 - Event 4 - Event 5
Client 3 - Event 1 - Event 4
When I have the option to share folders in Lightroom I can cancel my activity in Dropbox, because in Lightroom CC I can change something on the photos an my clients will see this change without extra export. For this it would be also necessary to have one photo in more than one album.