The benefit of Karlsson in the puck moving is also just the threat of having a guy that can motor up the ice. So you can catch other teams if they are cheating towards the forwards. Matheson provided that ability as well and some of his best moments were him streaking up the ice.
Now that said, if we are falling back to the tried and true but often unproductive pull up at the circle and drop to the trailer, I'm glad that is going to be one of Letang or Karlsson for the majority of the game. Nothing worse that watching the likes of Sid, Geno, Jake, Rust, Zucker, and Rakell passing it off to Pettersson or Dumoulin and watch them chest snipe the goalie who has a clear view of them with their wet noodle of a shot.