I've seen lots of exos in the tower with serving jobs like being a post person, cleaning, or being a guide. I feel like this is the proper role for all exos as I don't think they are very adept in combat. Whenever I see exos in the crucible I feel like I should destroy their ghost as well so I can dismantle the exo and use their parts to upgrade my weapons.
Sigh. Those are robots that do the cleaning. It doesn't matter if Exos are good in combat or not. I'm a lvl 8 hunter exo and I rek anyone I come across. They look beast and are super boss. Are you trolling or are you trying to make a point?