The weapon grip maybe not, but I think the wrist jack that you use to direct connect into certain things might be mandatory for some storytelling scenes.Second: even if cyber eyes are mandatory, why subdermal grip need to be mandatory ???
I believe that idea was that the games User Interface would be created straight into your cyber eyes. Also I think you must have them in order to see Johnny Silverhand (who is fully virtual)Third: why even force player to have cyber eyes ???neck chip sloot is need for story and jack in your hand is need for network ok fine and good, but any other cyberware should be up to player.