In general, less, a LD shaft will expose flaws in a player's stoke.
Aside from the change in aiming one has to do, I have found that lower level players that tried an LD shaft missed more straight shots with no spin, which means that they were shooting off center or were swiping with the cue instead of shooting straight. They learned to aim with the flaw with a standard shaft with how it deflected the line of aim, but the LD shaft would go straighter, causing the miss.