I think what we can say happened is this: when we switched to the current game engine, we got every improvement to this league that we hoped for.
We also saw that the ratings of the players mattered more than they had during the "dead puck era." The best teams won more often. Rebuilding teams took bad beatings. The finals stopped being 5 seeds against 7 seeds. Team which played their best rosters racked up deserved totals.
During the dead puck era, we all knew owners who warehoused, ran max playoff teams... most of us took a shot at it ourselves... but there was no proven benefit, so it wasn't worth complaining about. The first time I realized another owner was over-warehousing, I mentioned it to a fellow owner in private, and received no response. The owner in question never won a cup. It wasn't an issue.
Now that the ratings matter more than they used to, warehousing works. It's been proven. So now let's fix it.