I am some what torn about this; it seems akin to "stop telling women to do math."

I think it's a matter of semantics; no one (at least in these pro-woman-startup posts) is telling particular women that they need to do a start up. They are encouraging women to go into a male-dominated field.

I strongly believe that evolutionary biology sas on-average gifted men and women with different types of strengths; and while cultural idiosyncrasies have exasperated the 'problem' of a dearth of women in engineering, etc; there is also the issue of playing to our natural strengths and preferences.

So, of course women (and men) should do whatever the hell they want; and be encouraged in that regard, and, discouraged from falling into stereotypes.