We stopped using the bumper play after Kadri left. We had Tavares kind of there for periods in 2018-19, but they gave up on that very early, because Tavares wasn't that good at it like Kadri and Bozak were.
Now, the play is put Hyman or Simmonds or someone similar at the goal line, give them the puck, and then have them try and jam it far side. That's the only other play besides get it to Matthews and hope he can find a seam to get his wrist shot off.
IMO, the reason they don't drive the net is because of analytics BS: by keeping Matthews, Marner and Rielly/Sandin up high during a goalmouth scrum, they feel they increase the chances of knocking down clearing attempts with the extra area blocked. But that's dumb, because you don't score on PPs by playing it safe. You score by going to the net, giving your skill-guys space, and moving both players and the puck around quickly. And the Leafs haven't been doing any of that, I'd argue, all season. Matthews just managed to catch every team early on in the season by being just a step ahead on the PP. Now that everyone's caught up, Matthews can't do squat.