I'm a residential DJ/audio coordinator for a casino and quite frequently have to curate playlists with very specific types of music for a certain demographic or event, for example 500+ songs for an 80's themed party. All that music, in combination with my own playlists that i don't spin commercially, deep house, lo-fi, future beats, etc, in my rekordbox collection, has become increasingly difficult to navigate efficiently and freely spin music to suit the changing demands of my job, and the demographic of the crowd
Being able to filter out playlists from the collection that I dont use with frequency or that don't mesh with the crowd seems like a much more intuitive way of track organization, that still gives the DJ the flexibility to spin on the fly from his collection.
As of right now I've completely removed my personal collection of music from Rekordbox to declutter my collection and use Traktor to manage my non-commercial music, I've gotten quite fond of rekordboxs workflow and wish i could use it as my only go-to Music managment/DJ tool. It seems like a simple enough thing to implement with little disadvantages.