Dumping pucks in, per se, is not a problem. The next step after dumping the puck in is.... go and get the damn puck!
Even if the "system" (WHAT system?) incorporated the above fact, there's still the problem that the Pens are so weak, so soft, so timid, and so afraid of being hit. This makes puck retrieval rather unlikely most of the time.
The best explanation I've heard for the Pens' stationary, pass forever around the perimeter but don't shoot approach on the PP is that once they DO shoot then possession is normally lost because they aren't physically able to win a puck battle.... and down the ice goes the puck. Better to keep possession and inflate that all-important total of fake goals (xGF or whatever), than to risk actually getting a REAL goal.
I look forward to the Pens making the "xGF Playoffs" and excelling there, while other teams have to settle for merely making the real playoffs.