If the robot arms are only doing what the surgeon moves them to do, why is robotic surgery better and safer than the surgeon doing it himself
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If the surgery requires an incision of a very precise length and depth then the surgeon can instruct the robot to cut EXACTLY that much, and the incision can be perfectly straight.
That is not to say that human surgeons are not already capable of being very precise in their actions, in fact they are famous for this. But a robot can, in the right circumstances, achieve levels of accuracy that even incredibly skilled human hands cannot, when a difference of a few millimetres can turn a life-saving operation into a fatal one.
It’s also easier to keep a robot completely sterile. Even though surgeons and their staff go to great lengths to be meticulously clean when performing surgery, the risk of infection is never zero. Some patients might be extra vulnerable to infection from even the slightest exposure, robots help avoid that.
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