While it's probably overdone, we do it because most of human history has been centered on men and their assumed authority.  Assertive women who don't use traditional female roles find it offensive to say their life isn't complete unless they have a male head of household, government, military, financial industry, the majority of corporate offices.

It's clear women making the choice to move into traditional males roles are making gains by being competant and outcompeting young men in a variety of educational paths.  IMO, that's a good thing that helps to max the countries skills and talents.   I honor those women who take more traditional roles as well.   It's their choice.

You'd be right to say genderspeak is only symbolic.    But symbols count in society when they move from 'curious' to common.    Symbolism is a big deal in trying  modify the public consciousness.    

You don't HAVE to do a thing my friend, don't use genderspeak if you don't like it.