Surgeons are probably the last true bastion of hard core Trade Unions.
Although I've often wondered if top class Snooker players have as good eye/hand coordination.
I have rarely seen a field where so much potential good has spent so long in coming to being actually useful. It's "hands" can be made smaller and its motions faster. Best of all making more surgeons is a production engineering problem, not a decades long educational one.
As regard to how "good" a robot surgeon is let's try for the basics.
1) Narrow range of very common procedures. The kind surgeons don't want to be stuck doing.
2)With as good a survival rate (for the given class of patient) as a good surgeon.
3) Ideally operating at least as fast as a good surgeon, but 2 is more important.
4)Able to perform as many procedures as a good surgeon in the same time frame (week, month, year). So no ground-up rebuilds after one.
5)Cheaper to purchase and support than a first rate surgeon on a yearly basis. Around £70K pa for a General Surgeon (the kind you'd prefer not to have operating on you if it's in any way specialised) in the NHS.