What does a robot "soul" actually buy you, though? I mean, the Matrix allowed the creation of sentience, but one would be hard-pressed to argue that such a thing is required for top-end Marvel folks to create sentience in machines. Tony and Hank have flat-out done it, repeatedly, as have some others. Doom hasn't exactly done it - creating an independent, unique being like those two have, but his high-end Doombots, running copies of his own mind, are sentient enough that others and they themselves often believe that they are the real Doom. When they malfunction, Doom has had to off them himself to take back his position.