Virtual DJ doesn't need to potentially export those playlists for use in a CDJ, which is where the biggest holdup in this situation comes from.
As it has been outlined in other posts, rekordbox was originally designed for exporting your music for use with a CDJ. As it evolved, it became a DJ software, and then added video, but it is still very much a hub for all your music in one ecosystem.
If a DJ had a mixed playlist of audio and video, exporting that playlist for use in a player that can't handle video would be a problem - a portion of their playlist would be absent.
Our engineers are working on the best way to allow for this, but we don't have a timeline for its inclusion. Thanks for your feedback and patience.