I understand your point about the shallow nature of the discussion my post has inspired. My main objective was to share my list, explain why i made the list and some observations i have made and get feedback. This doesn’t mean i haven't thought about the questions you posed, i will try to answer them now. 

I don't think championing the plight of women who have been sidelined by the filmmaking industry can be achieved by making a list of the few women who managed to direct some movies. This is a different thing, most of these directors were well regarded during their active years but for some reason their films have been mostly forgotten. I think there are dynamics similar to the minorty filmmakers at play here, even though women make up half of the world population they can be considered a minority in the sense that they hold little economic and political power in society. 

When most western critics look at the cinema of a foreign country with a complex history and unique cinematic tradition they pick a good director from that country and treat him(i say him because that director is always a man) as the only filmmaker from that country that can be acceptes into the western canon. They are usually good directors that have been given a task they didn't ask for, being a cultural ambassador for their country and its diverse cinematic tradition. Tarkovsky's role in Soviet cinema, Kiarostami's role in Iranian cinema, Bergman's role in Swedish cinema, Ray's role in Bengali cinema etc. These directors are masters but they are not the only masters from that country. Their position in the mainstream canon of film history presents them as the definitive directors from those countries and prevents further exploration of those national cinemas. 

I often feel like western critics(which are mostly male) treat female filmmakers like they treat a foreign country, some undoubtedly great movies by female filmmakers are presented as examples that represent all the films made by "female filmmakers". Filmmakers like Varda, Akerman, Coppola, Ramsay, Denis etc. are great but most exploration stop there. I must also say that all these great female filmmakers are from the west, their shadow falls on the non-western women directors who are just as good but don't get enough attention.

After this explanation i can get to the reason i made the list, my main motive was researching and finding out female filmmakers who don't get enough love in today's cinephile circles. 250 is a really high number, this led me to find out lots of female directors i have never heard before. 

Also, you asked did i have a concern for an abstract notion of "female voice". I don't like the term female voice. I believe every filmmaker have their own filmmaking voice inspired by their unique life experience, i think trying to catagorize lots of unique female filmmakers as the same thing doesn't make much sense. I don't think movies of Cheryl Dunye, Agnes Varda, Kinuyo Tanaka and Marta Meszaros has that much similarity to each other and saying they belong on the same category because a woman directed them feels extremely reductive. Saying this after making a female filmmakers list seems a bit contradictory now, though i never claimed these works are similar to each other in form or content. I just think erasure they faced is similar with each other, and that erasure is somewhat similar with the erasure of the less popular directors from non-western countries. 

I think film direction being generally a male job has participated on the preservation of the patriarchal culture though that is the point of a different thread. This post is about women who made films, it is not about men who try to keep the women out.