What the playoffs should have shown Rangers management is that the Rangers could never hold up in the playoffs as currently constituted.
Their physical game is woefully poor. Nothing to do with fighting. Those days are gone. Very few Rangers play the game in a way to excel in the playoffs. Sure, Zibanejad and Panarin should be able to overcome that, but when most of the lineup cannot compete for loose pucks, there will be problems.
Management needs to sacrifice some slickness for bigger players who enjoy the power part of the game. However, they can't just be that. They have to be talented, too. Losing Fast will not help.
Tampa Bay has learned this lesson the last few years. Toronto hasn't. Hopefully, the Rangers will.