1) Aiming aid using very long bridges, longer than previous pros.In the past, all pros (most of them) used close bridge. Every instructor was advocating close bridge as the way to go.
Nowadays, all the pros (most of them) use open bridge... what changed? and when?
For snooker it was always open bridge, the snooker stance was different and the chin is on the cue so that gave that extra contact point to secure the cue position and a closed bridge would block the player's view.
So I get pool players that put the chin on the cue who use open bridge but many don't put the chin on the cue, so why not close bridge?
2) Amateurs are now using very long bridges as well, therefore, and also, negatively affecting their play.