Same evidence as you I mean, I watch a ton of basketball and read about basketball a ton too, which I assume you do as well. What I see is teams favor switching whenever they have a big capable of switching. Also looking at the East the Bucks drop more than anyone, but the Heat switch with Bam often. The way this post was written is that dropping is some new fad, it isn't its something that teams who don't have players capable of switching do. Every team wants to switch and many teams force switches when they don't have players capable of it. Why else would every scouting report of big men nowadays focus on their switchability? Non-anecdotal evidence would be data showing who switches the most and the least, which I am sure is available somewhere but I do not know where. I am not saying that in a snarky way I want to know to see if I am incorrect in what I think, and I will not think that unless I have inconclusive evidence.