For me, at least, there is too much effort required to find the right bucket of beliefs that our opponents hold, many of them shifting like wind blown sand. Thus, it is easier to characterize them by what they are not, they are not Calvinists, and I leave it at that.
I make a few exceptions to this rule, but mainly regarding those who are on our "side" of the fence. An example is drstevej, an honest Amyraldian.