[KTL]

I'm not sure why this is "scary?" Yes caster makes a big difference and the steering feel can be changed drastically w/out much change to caster at all, as nicely detailed by Vincent. However if the steering is light or heavy, the postive caster still provides the desired self-centering effect.

Plus the light or heavy steering is somewhat of a preference depending on the car's target environment. On a track car, the heavy steering is more precise as the inputs are much quicker. On a roadgoing car, the light steering is nice for around town manuevers such as turning sharp corners or parking the car.