Part of Bettman's parity scheme. Restrict talent and skill with obstruction and bigger goalie equipment(which remains much bigger than before he became commissioner) and obstruction to give weaker teams a better chance of winning.
The media and fans kept complaining that hockey is less entertaining. Where have all the goals gone. Bettman would make it look like he was addressing the problem by claiming that the league will crack down on obstruction every subsequent year which they would give up oin early in the season claimimng it is impossible to police. All the while holding hockey hostage until he finally got the Cap to help with parity.
Player stats should come with an asterisk denoting seasons played while Bettman was commissioner (some players have lost 150 games due to lockouts) and had to play their careers while skill and talent was being artificially restricted.
Yeahhhh... Bettman told coaches to come up with the trap. So Bettman innovated defensive hockey schemes with his prolific knowedge as a former NBA executive with no real background in hockey.
Oh, and apparently Bettman should be held responsible for Patty Roy popularizing the butterfly, goaltending equipment companies selling bigger gear and all those dry seasons that hurt farmers.