Say I'm standing at the long rail with the corner pocket to my left, the cue ball is half a diamond up the long rail and a diamond away from the long rail. The object ball is on the opposite long rail about a diamond and a half up the rail. So I have to cut the ball to the left to bank it in the corner pocket next to me. The cue ball will normally put a little counter clockwise spin on the object ball, throwing it high and hitting the long rail above the pocket, necessitating a thinner cut for the object ball to make it in the pocket. By putting outside spin on the cue ball, it no longer imparts spin to the object ball, it just rolls across the surface, and the object ball follows a path closer to that suggested by the line of centers and the normal angle of a bank shot.
I'm definitely more accurate with spin with the 314 but If I need to cinch a shot and I'm not using spin, I'm not getting the accuracy I'd like. Things like a ball on the spot and the cue ball behind the head string. With a solid shaft, I was sinking a few shots that I didn't really expect to. With the 314, I'm missing a few shots that I expect to make. If it's an easier shot and I can use spin, I'm much better with the 314. Maybe as I get more used to it I'll become more accurate or maybe the other advantages outweigh the decreased accuracy but I miss seeing balls go into the pockets as well as they did.