what is wrong with vertical pips ?

Can you be more precise. I play pp and it has vertical pips. I trained myself to hit like he zoughja. Her counterhit is a hit that has the bat pointing to the ceiling and finishing a bit closed. I understand that pips not in alignment with the ball direction make more a floating ball. But when you change the way you hit it work pretty well. In.fact it can confuse the opponent.

Ex: If I push the ball with the bat pointing to the side ( parallele to the net.) and if the pips are horizontal the ball can have reversal as it glide between the pips. With vertical it will hit the pips and stop the ball rotation a bit. So it create more of a float. But again if i do like a penholder and push in front of my body with the bat pointing toward the net then i will have reversal or depending of the density of the pips can get an underspin ball has it get more in contact with the sponge.

Has many players play horizontal pips I can understand that they have problems with it. I can hit a very hard drive with my bat pointing to the floor. The bat hitting the ball a bit upward, the ball has reversal and it create a strong top spin. See on youtube a guy play matches with the aggressor rubber and do fast topspin with it.

I agree, it comes down to technique, that is the difference between Do Knuckle and Super Do Knuckle. One I feel more comfortable with the other I can play with, but would have to adjust my strokes and contact points with the ball to be really effective.