4 is the most I have ever had and what I have now. An Autel EVO 2 Enterprise, Mini 3 Pro and 2x Mavic 4 Pros, one regular, one creator combo. I have 20 batteries to maintain between those 4, I can’t imagine having yet another drone to keep tabs on.
For those who use DXO labs software for working with DJI Mavic files, they now have an update available for the Mavic 4 Pro. I'll give it a whirl a bit later but look forward to seeing what they have done on the improvement end of things.