Because it's easier to get facts about what it's like to live in Germany if you aren't a German than it is to get facts about what it's like to be a woman in patriarchy if you aren't a woman.
To put it another way, until it's possible to print out and debug human connectionist networks and association maps, most of the knowledge about gendered oppression can only be obtained by listening to women.
This is, of course, something that men under patriarchy are loathe to do, which is why Less Wrong (a male-identified male-dominated community) insists that men are perfectly fine sources of feminist analysis.
I certainly don't expect Bob to give more useful answers than Hans a majority of the time. When it changes from Hans & Bob to Alice & Bob, the percentage will fall further.
In short, your position is that men have no useful input, which is very different from saying that they seldom have useful input. Bob should never have become a professor of feminism, as you describe the issue.
Upon reading Eliezer's possible gender dystopias ([catgirls](http://lesswrong.com/lw/xt/interpersonal_entanglement/), and [verthandi](http://lesswrong.com/lw/xu/failed_utopia_42/) and the other LW comments and posts on the subject of future gender relations, I came to a rather different conclusion than the ones I've seen espoused here. After searching around the internet a bit, I discovered that my ideas tend to fall under the general category of "postgenderism", and I am wondering what my fellow LessWrongians think of it.
This can generally be broken down to the following claims:
EDIT- Due to some really insightful comments;
I replaced men being prone to aggression as a negative, with men being prone to suicide.
I made the verbiage a little more explicit that no one would be *forced* to change, but would seek out the changes that transhumanism would have available.