For surgery I think we won't have much of a choice the more advanced technology gets, though for now there are doctors that work with robots for more precise cuts, which will lead to more successful surgeries. But yes, at this point to have surgery performed only by a robot is a little risky. They do not have the capacity to consider the well-being of the person, it's just programmed to do as its told. That human element is also extremely important to a successful surgery. Just the holding of a human hand (on part of the patient) can aid in relaxing down patients before surgery. At this point it makes the most sense for both to work together.