I get your point, but those who run a ton of Statistical analytics, seem to think it doesn't. In most circumstances, it takes too long to setup the shot, and they get blocked, end up out of the zone, and are harder to deflect.
Noting, the top 3 teams in the league on the PP are Edmonton, Tampa and Boston.
Their top D men in PP minutes are Barrie, Hedman and McAvoy. They have a combined THREE goals on the PP this year... between the three of them.
This argument is based around how critical a Point shot is... when the three top teams in the league, have three goals from their top D, on the powerplay... in half a season.