"Let 'em play" has found its way back into the game, recently.
There are several penalties being called in the NHL right now that I really despise. The 'puck over the glass' rule is endlessly frustrating, the trapezoids behind the nets seem ineffective, and the 'covering a puck with your hand' in the D-zone rule is transparently a desperate attempt to call more penalties. In short, the NHL appears willing to go so far as to embarrass itself for the sake of emphasizing skill/scoring, and cracking down on loopholes in their rulebook that basically protect cheating.
While it's clear that the NHL hasn't got it all right, all the time, the league deserves a lot of credit for taking obstruction out of the game.