When you head to the Tower Hangar and go below deck there's that mechanic fixing up one of the security exos/robots and I thought it would be cool if you could purchase one or two as like companions for single-man fireteam quests and patrols. Brings me back to Ratchet Deadlock days where you had the two robot AIs that helped you, you had to fix them when damaged, you could upgrade them, they helped you open doors and whatnot. Just imagine being able to have aid when your fellow guardians werent available and all the potential gameplay aspects it could open up from using pressure plates and forcing open doors to funny dialog options.