I just made a simple observation yes. Whatever reason we find will fallback to men being different than women. That is in fact the only think we can say for sure. The outcome might not be fair, but it's not by denying this fact that we will make things better.

As for you example, it's flawed. 200 years ago doctors played a very different role in society of those of today's doctors. If you look carefully at today's society and try to find a social role more like that of a 1800's doctor, you'll probably find a job that is still done mostly by men. Is it fair? Indeed no. But it is in fact a good example how we can improve women rights by going to the root of the problem without fear of being political incorrect. I might not have any evidence, but nor have you.