A big problem with auto ISO is that the camera is exposing "everything 18% gray mode" as I've come up with my own patented phrase. So when I'm shooting soccer, and the Ashland U team irritates me by wearing white jerseys on their day games, exposing 0EV with CWA will make the jerseys look gray, like the camera is supposed to do. Likewise, you'll get an overexposure with black jerseys at 0EV and CWA.
So I cheated. I first bought a 1Dx so I could do this. Then I just shot in Tv mode with a custom function, auto ISO and +1 EV. or -1EV, or whatever, using CWA. I think I set Tv mode to 1/3200s, max aperture f/2.8, min aperture f/3.2, auto ISO, +2/3 EV on white jersey day, and used CWA. So I actually did use auto ISO, I just also exposed to the right.