I was trying to avoid the purely theoretical context for a reason
It is definitely worth thinking about and knowing that a truly neutral car is slower than a car with slight oversteer, so hurray physics.
Mathematically neutral and real world neutral are two different things, in my experience. For example, I consider my BRZ neutral, but everybody that's ridden with me comments on how "active" (aka tail happy) I like my car to be. Someone that prefers that little bit of understeer is likely driving a car that's actually mathematically neutral