I think I read somewhere that Warchest was hesitant to remove the Auto-Turret/Ammo Station/Healing Stations from the Merc Models as they wanted to make sure players could quickly and always identify a friendly or enemy merc.
But, I think after just a few hours of play everyone is quite familiar with the appearance of all the mercs. And showing the mercs without their specials would be a need feature. You could even do it with Sawbonez Health packs and Skyhammer and Arty’s ammo packs.