Obviously, it would help individual women get courses they want but otherwise might not have access too.
Does it help women generally?
Feminists would take the attitude that if you help women individually, you are helping women collectively.
But in the long run, doesn't this continue to "women always need help" line of thinking? Doesn't this basically mean that the system has given women inherent advantage and it is reasonable to assume that they NEED that advantage or they can't compete?
In the long run, it hurts women.
It only makes sense if you do it for a short term to correct a problem that will then stay corrected.
It only makes sense if there is sufficient demand by women for STEM positions that there is the belief that this would change the ratio permanently, AND that changing the ratio permanently is a good thing. Even if you buy the latter, the idea that women are going to change their desires coming into school is ludicrous unless you intervene at an earlier age.
So in the long run, all it does is hurt women.
In the short run, it obviously hurts men (and for those of you who don't understand why, you clearly need to take a look at the math. There are a limited number of educational slots. If less qualified women are getting educational slots and jobs over more qualified men, yeah, it hurts men) - but only in the short term as individuals.
In the long term, it continues the "women are inferior in STEM" attitudes that prevail both educationally and avocationally, and that hurts everybody, male and female.