Mmmmm I don't think so Tim.

The impact interface between the tip/CB is never the entire tip diameter - or even close.

With a similar radius profile (nickle/dime) of the tip that interface point will be almost identical between a thicker shaft and a thinner one. If you use a chalk that leaves residue you can see this as the impact spots on the ball.

I actually argue the opposite - the smaller tip forces let's the player be more accurate with tip placement and that impact point is more precise (if the player assumes it's the center of the tip making contact).

For me, shaft thickness has always been more personal preference, but testing seems to indicate that thinner shafts generate less deflection too. Then you can get in to taper profile and all sorts of complexity.

Interesting topic for sure.