How many more careers to be ruined, Stanley Cups lost, because the professional players won't wear full face protection? Barry Ashbee, Brian McCabe, Jeremy Roenicke, the list goes on and on... Every team, every year risks its competitiveness on this.
Yeah, I know, it interferes with their play... and every one of these players learned to play the game at an extremely high level wearing full face protection.
The macho-macho men of the NFL have no problem wearing larger and heavier face-masks, and all they need to fear is flying elbows, eye-gouging and such, not frozen rubber pucks coming at ballistic speeds off composite sticks.
A half an inch lower, and Brayden Coburn would be missing an eye and the Flyers would be missing a fine player for a long time if not forever.