After getting killed inside in the playoffs against the Cavs, they resigned Milsap, traded for Splitter, and just signed Tavares.
They got bigger, stronger, and better across their front line.
They essentially added another way to play. They can still spread the court and shoot a lot of threes, but they can also pound it with Milsap, Horford, and Splitter at the 3, 4, and 5.
They still need a Lebron stopper. They will miss Carroll from that perspective, but remember that they get Sefalosa back. I also wonder if they might trade Scroeder or Teague for a "swing" player.