Interesting data, for sure.
However, I wouldn't read much into it. From the first graph alone (the difficulty), it is easy to see that a sizeable amount of data comes from inexperienced or occasional players, who have no idea of what's even going on. All of the data below that support this claim, especially the division design.
I would honestly prefer it, if you would filter out all data from "easy" or "very easy" campains. Then perhaps we could see how the hivemind has reacted to the NSB changes.