Everyone ignores it because the visual evidence demonstrates that what they are saying is incorrect.
They don't realize (acknowledge) that the penalty sliders trigger certain animations or actions. The higher the slider, the more likely the animation is to occur, which affects how the game plays out, even if the penalty is not called. The obvious example is the holding slider - ratchet it up high (55 or higher) and the line play becomes incredibly sticky and there is minimal block shedding (low and it's the opposite). DPI is the same sort of deal....higher settings and DBs are all over the WRs (even if the penalty isn't called).