Looks like we were wrong about the three Arms on Nero’s waist/belt being for Style (Arm) Switching. Even so, many in the community still believes he has a form of the system base on the small information we’ve collected from the small bits of gameplay.
Itsuno mention in this link https://mixer.com/Xbox?vod=38224649 (interview starts around the 3:53:00 mark) that the Arms will break and Nero will basically Reload another Arm via his waist. So there’s some type of Durability on those Robotic Arms.
Also, there’ll be more DMC gameplay on June 20th. Time to hibernate for a week boys!