On the other hand, if I were to have brain surgery in 2030 I probably wouldn't want the world's best surgeon from 2010 to time travel and do it. I agree with y

On the other hand, if I were to have brain surgery in 2030 I probably wouldn't want the world's best surgeon from 2010 to time travel and do it. I agree with your broader point, but your specific example is unfortunate. Surgery, and brain surgery in particular, has a lot more in common with the 19th century than the 21st. A disturbingly large amount of brain surgery is still accomplished via drill and very tiny ice cream scoops. I'd be surprised if that changes very much even in 20 years.