Well, for me Engine Prime does enough as a library software. It could have more options like relocate and some more usability improvements, but for making a playlist for a festival set, plus some other club sets, and setting up my hot cues and loops - does the job. As I play mostly festival stages and clubs, I don’t get to play the whole night, so I build playlists max to 2 hours (that is 3 hours music files). Then export on 2 usbs (one backup) and that’s good to go. So for me Engine Prime does enough and I am happy with it.
More I did in Traktor back in the days, but that was different style of Djing (remix decks) that I miss in hardware form now.
DVS or not - as I said, motorized control over second layer - great idea. I am all in to it. I would also want to see the REMIX decks style looper/sampler/rmeix box specifically build for Prime eco-system.
Then my life happiness will be complete 