I don't understand how you can outright state that more people using JBs cause poor jumping. The CB is MUCH more likely to jump off the table when using a regular cue to try to jump and hitting the impeeding ball on it's way up of down. The JB makes it easier to jump which, in turn, probably takes down the number of balls flying off tables because of bad jumps.
Now your areguement couldn't be denied if you were complaining about people that don't know how to stroke a jump shot killing cloth and the slate on good or even bad tables.
Now your areguement couldn't be denied if you were complaining about people that don't know how to stroke a jump shot killing cloth and the slate on good or even bad tables.