Subsonic made the change to database-stored playlists (i believe) to support individual playlists by user.
I would suggest that the option to either use the old style of folder-based playlists, or, even better, if each user had a setting for their own playlist directory, and this was an additional option, it would be beneficial.
One can only ask... perhaps Sindre will consider your request.
Subsonic 5.2.1 (Standalone on Apache/Tomcat 6)
WHS 2003, Dual Core Athlon, 4 Gb RAM, 12 TB
50 regular Subsonic Users
Library as of 2016-03-21: