Originally Posted by
Skyblade
Past Chapter 6, it's not really the same content. Putting the bosses into groups makes the battles play out very differently from the original fights. Techniques that were used to stop a single boss aren't much good when they have friends. It makes you rethink your entire setup and strategies. And the story for the encounters also radically shifts. Those changes make it well worth the extra time, in my mind. It's Chapter 6, where you're doing the exact same fights with (almost) the exact same story that really brought down my interest.
In the original version, these chapters were all DLC that essentially were exactly the same. The For the Sequel remake of the game changed them up a little, and the Western release version actually changes them further still.