In titles like iRacing, as it is a sim it is generally regarded that the way to race is with a wheel. Some do use other (accepted) methods of driving.
I think it's a case of each to their own, as maybe the guy with a controller can't afford a wheel/pedals combo.
I don't think that the fact that A is quicker than B because he uses a different controller method is cause to class it as cheating. Not shooting you down Scott, but like you, just my opinion on the subject.
Same as someone who uses auto gears compared to a guy who races with manual gears. If the guy running auto gears was quicker, would you say he was cheating? Or you have a a guy running auto-clutch (as he only has brake/throttle pedal) compared to a guy running full on manual setup and no aids. Would you say the guy with the auto clutch is cheating if he was faster?
For me cheating is where someone is using some form of assistance that the game/sim does not allow to attempt to gain an advantage. If flightstick, controller, keyboard or wheel are allowed, then so be it.
As referred to earlier in post, not a flame shoot-down, just my opinion in response to Scott's.