Ummmmm, this has not been my experience at all. Women seem as perplexed by men as the other way around. Believing you understand how someone works and thinks is not the same thing as actually understanding how someone works and thinks.
Besides being wrong (just do a google search for "how can I understand men") I find this part of feminist theory to be incredibly sexist.
EDIT: Also, if women did understand men perfectly you would think they would have absolutely no problem getting exactly what they want from men. If I understood someone perfectly, I would absolutely know the best ways to manipulate them. If your statement is true, the fact that women are still unequal in some respects (seats in the boardroom/more opportunity to improve career/etc) would probably mean that women don't want the opportunities they claim they do. After all, if they understood men as well as you claim they would have no problem extracting those opportunities.
If you can't get someone to do what you want, you definitely do not understand them perfectly by any stretch of the terms.