In real racing cars and even rental karts, you drive with your butt. As long, as you can't afford a well tweaked, not overexaggerated motion rig, you will rely on FFB. That's the reason, why FFB exists, besides the reason, it gives you the sensation of a vehicle, moving on wheels over the ground. It is not the requirement, to make it more realistic, it is more required for most users, to make it informative, to be useful as a learning tool. It is the better design decision/compromise for most consumer use - setups. Even if some solutions are still confusing and "overriding" natural behaviour of simulated cars, that's why some wheel setups, user&development wise, can lead to strange behaviour. (For example: Oscilating or clipping FFB, because set to strong, wishy-washy feel because of too much dampening, which also leads to less response of self alligning in the mix and so on...) That's why something like ACC with more "real" approach also has its place, because less is more sometimes, but it isn't the most informative thing for consumer use.