They made the game open-world, the PC optimization is questionable, the combat got a revamp that people seem to pretty much either like or hate (with 9:Empires' being somewhat more liked), Koei did as Koei does and locked several officers' signature weapon types behind DLC, and so on. They also did the same monetization model as they did with Dead or Alive 5 and 6, where you get the skeleton of the game free as sort of a demo, then can buy officers (along with their story mode and online mode access) separately or buy a pack with all the season passes + officers.