That is very true. I remember back in the PS2 days when NCAA Football had the knockdown slider. The guys at EA said it only related to the DL when the truth was it had a far bigger impact on DBs. I actually loved that slider since it controlled how much reach a DB had to knock down balls. At 99 they could super swat. At 0 they were almost a ghost and barely made plays on the ball.
I've asked this before of the dev teams and most of them just play on default. And whenever I've asked a prominent game changer about the sliders they can't even tell me if they added or changed anything since they never look. They need at least one game changer just to test this area and get it right.