As far as I can see, the differences of knowledge or opinions that really stand out are those between individual hikers, without reference to their sex. On the other hand, if you were to average out all men hikers and all women hikers and compare the results, they'd share about 99% in common in terms of hiking-related interests, problems, approaches and ideas.

I am aware that internet forums are notoriously dominated by men and often are seen as unwelcoming to women, so that having a women-specific forum might overcome that obstacle. However, my sense is that this website is extremely polite, our discussions are quite gentle, and we're very focused on being helpful to all comers, so that such a woman-specific forum would either attract very little traffic, or else replicate threads that already exist or fit comfortably in some other forum and would benefit from a wider participation than just our women forum members.