As a beginner, I have not taken too much importance to that aspect of DJing, up until now, I'm trying to make a setlist respecting that. I find it binding. So if my track is 3B, I could go 2B, 4B and 3A. 2A and 4A are off limits?
In my case it's a yes. When it became possible to play Spotify setlists in Serato and Rekordbox, for me it was the occasion to try DJing with my own setlists. So I started learning how to use Rekordbox on my laptop, with a lil help from tutorials on Youtube. After about a month, I definitely was hooked, so I bought a DDJ-FLX4. For about a week, I had the tendency to use my computer mouse more than the controller, but afterwards the controller took the lead.