Being a SADX Competitor myself, playing on PC, I actually agree that it would have been better to of had two seperate charts from the very beginning, as your right about their being differences. . (and yes, at points I do wish I had a DC, lol) but to be honest, trying to seperate it now, would be very difficult as too many years have passed now and in my case, the DC players that play SADX are all better players than I anyway, so I wouldn't really want the lists split as of now. . . as removing players that have used DC=(Gamepro011, Jawzun, Avento128bits, F-Man...etc) all whom are I believe are retired from SADX, with them on a different list, then competiting wouldn't feel the same :/
As much as I agree with you. . its just too late to change it >_>