Recent Paper Mario games have implemented new tweaks and changes to the battle system, making for a unique experience each time around. This isn't just by accident either. In an interview with PCGames, producer Kensuke Tanabe says he finds this approach a necessity.
“Striving to find new and innovative systems is the foundation of the philosophy my team and I are following when developing games. As such, I think it’s a necessity that the combat system changes in every game.”