I don't agree that would be too accountable; holding someone responsible isn't the same as holding them blameworthy. In any case, the vagaries of chance should be acknowledged as a contributing factor.

But I can easily imagine that, in very difficult surgeries in which the chance of catastrophic failure is quite large, doctors are perfectly willing to deflect praise for success in order that failure not be associated with them as well.

It's easier not to be considered responsible for outcomes, sometimes, even when logically we have at least a contributing influence.