Patrick Johnson said:"The whole idea behind providing less deflecion is the shaft moves (or flexes if you will) so that the ball isn't pushed off line."
I'm no scientist, but I understand from players who are scientists that shaft flexibility has little to do with cue ball deflection. They say it's all about the amount of "mass" in the first several inches at the tip end - which is why Predator (and now others) are hollowed out there. Meuccis, for instance, are not considered low deflection cues.
For another instance, I use a stiff shaft with a "conical" taper (no parallel "pro taper" part at all). However, because it's hollow near the tip and because the tip is very small in diameter (10mm), there's relatively little mass in the tip area and therefore little cue ball deflection.
pj
chgo
Well you can think what you will, but it is a combination of the two. If the end mass is less, and the shaft also moves (flexes) then the cue ball will be less likely to be driven off line.
You can say you are not a scientist, but it is simple physics. Besides all cues flex to a certain degree. If they didn't then radial consistency on a shaft wouldn't matter.
Would you rather be in a car wreck that you hit them head on, or one where you took the time to veer to the right and just grazed them a bit?
It is the same principle. If the shaft doesn't flex or move you will drive the cue ball off line more because something has to move out of the way.
For every action there is an opposite and equal reaction.