It works less often in the playoffs.
The Sedin twins still put on plenty of shows on the west coast in the postseason.
I don't think guys like Panarin and Zibanejad necessarily need to change their games wholesale, it's that the bottom half of the lineup needs to play more direct. You want your 3rd and 4th lines to go out there and grind down the opponents, knock in the odd goal, and soften things up for the skill players, especially by drawing penalties.
The Rangers have also had next to no vertical threat on the ice since AV's departure.