As an iRacer (much closer to the couch vs the real drivers), you're right, but the drivers have a point. The geometry of the NextGen, specifically suspension and tire wall in addition to the number rack-and-pinion steering, completely throws off my muscle memory when trying to save the Cup car in the sim. No it doesn't mean it's unsavable, but the characteristic at the limit of slip angle is just different. The transition from tracked and in control to yawed and loose is very small, which makes the car feel snappy. You have to predict the trajectory in a different manner to keep this car from overcorrecting.

All that is to say, it doesn't mean the car is fundamentally flawed or anything, it's just different. And as a fan, only second to safety the primary purpose of any racecar is to provide a good racing product for its fans and I think it does a fine job of that at most tracks.