But that consideration can be controlled, and even used by advanced shooters. The flexibility of a shaft matters, and becomes a serious factor when using english. The illustration at left should demonstrate the reason. Using too much left english will cause the cue ball to squirt right. The amount of squirt is not noticeable to the eye, but is a serious threat to aiming.
All shafts bend.
It is a question of how much. An advanced player can use squirt by compensating for it when aiming. Unfortunately, the much desired pro taper, which decreases the circumference of the shaft further up the shaft, increases the probability of squirt resulting from shaft flex. Since force also affects shaft flex, and weight is a factor in force, heavier sticks may exacerbate the problem. Again, the shooter can adjust to all of the above.