however all said less weight up front means less deflection. that's a given.
but so called total deflection/(deviation) of the cue ball, is not 100 percent from the weight of the front of the shaft.
it is easily controlled by yourself by where your aim, and how you hit the cue ball and its speed. that comes with table time.
sure if you have to hit a shot with a certain speed and same amount of spin with a level in line cue no matter what,
then a lighter front cue will deflect less.
So I think there's a lot of confusion about the benefits of low deflection technology and in what ways it benefits you.
The most common misconception I think is that it becomes easier to adjust for side spin. Nope, not true. It's not easier. Learning how BHE and FHE works is the best way to compensate for squirt and it's just as easy with a high deflection shaft as a low deflection shaft.
The true benefit comes with the consistency because of the minimized squirt/CB deflection. Any time you're having to adjust less for something, the consistency will be higher.
Another misconception is that you don't have to adjust, you just aim like you're trying to make the ball. It can seem like this is the case but it's not. The natural pivot point is pushed back (in some cases, WAY back) but it's still there.
One thing you'll notice if you compare modern players to players from the past is where they bridge and where they hold the cue.
Traditionally it was taught to bridge 8-10 inches away from making cb contact. I REALLY think that this was because that is where a standard maple shaft's natural pivot point lies. I don't know that they were aware of it, but bridging at the shaft's natural pivot point allows for stroke flaws and deviations to really not affect making the shot as much (it does still affect the expected position though). That's one reason why many players can make shots but are always confused that the cb doesn't end up where they expect. It's due to stroke flaws that they aren't aware of or haven't addressed but since they bridge where they're supposed, they still make the shot.
Modern players bridge 14-16 inches, typically, and wouldn't you know it, that's where the natural pivot point on modern ld tech tends to be, and they grip farther back on the butt which allows for the pushed back bridge while still maintaining close to 90 degrees of elbow bend at poc.