The more caster you have, the greater the distance between the contact patch and the steering axis.
Therefore, cornering force from the road has more leverage on the steering knuckle, and more cornering force is transmitted to the tie-rods, and ultimately the steering wheel.
This can be considered the "good" kind of information to convey to the driver. For instance, if you turn the steering wheel, but the torque felt stops increasing, that means you're plowing the front end.
Torque transmitted to the steering wheel that is unrelated to cornering force can be considered "noise" that is unhelpful to the driver, so by increasing the amount of good information, you drown out the undesirable information.
It is possible to increase the required steering effort such that the vehicle is unsafe to drive without the power steering. I suggest you do some test drives with the power steering disabled to make sure that you can still control the car in case of failure. Having a passenger cut out the assist mid-corner without telling you would be a worst-case test.
I think that with a lot of caster (sorry, I don't have a number), the camber would change as you approach full lock. I don't know if this could cause a bizarre difference in behaviour between high speed and low speed corners.
Mercedes cars have a lot of caster:https://www.driving.co.uk/s...ongest-car-drift.jpg
Also, note that there's a difference between having the wheels self-center with respect to the chassis, vs. align themselves with the vehicle's direction of travel. In a drift, the chassis is not aligned with the direction of travel.
[This message has been edited by pmbrunelle (edited 07-14-2020).]