>>96836941
With Admech it's hard to say where the user ends and the armour begins. With SoB, they didn't use to have any augments necessary for the suits to function, but then GW decided to give them plugs too, because of reasons. The Carapace isn't just for controlling the suit, but enables direct input back and forth. A marine in armour is unhindered by it, sensing the world as if there was no armour.