Quick test; Pick up a couple of eggs. Put 1 in the palm of your hand, use the tip of your fingers, smash that egg. Now, grip egg between thumb and length of fingers, and smash. A lot more people can do the 2nd.
Driving on a race track, where everybody is going the same direction is not same as road. With power steering, any impact that will spin the steering wheel hard enough to harm the thumb will spin thru your hand.
As for the 10-2 vs 9-3, I can't say much. I wonder what the folks that write the report drive most. Bet it's the desk. Millions of miles of driving, mostly I hold at 11 solid, and 5 when I expect a bump. This lets me see gauges, hand close to shifter. When I need to spin the wheel for tight turn, straighten thumb and fingers, increase pressure on palm.
No, I can't say my way is right. But in millions of miles I have never lost control of a vehicle because the wheel slipped in my hand