That sounds to me like you're over analyzing it. IDK, but I just don't think that the designers of those stages said, "let's see, what can we design a stage to test this time". I think it was more like "hey, let's try this".
But they all, except one, are stand and shoot 5 plates as fast as you can. Why just that one?
And even if they do test those different skills, why do we need to test movement. As has been said, there are plenty of other places to test that.
IMO.