I don't think I am. Since coming to Pittsburgh Pettersson has been one of the most hit d-men in the league. Someone may have to go and look at the numbers, but I have a feeling that he takes a lot less hits with Jarry in net.
Also when the team knows that the goalie can move the puck, it takes a lot of pressure off of the forwards, so they don't over back check and leave the trailer open.
Over the long haul, the amount that that affects how well the defense as a whole plays in front of your goalies is not dramatic. But none of this really is making a good case for Murray's value.