ok, been pondering this.
the ideas behind communes pretty much only work in small-scale groups, as large groups always end up with some kind of hierarchy (if anyone knows of an example to contradict this, please tell me).
BUT just because male/female/integrated groups would all have a hierarchy, does NOT mean that current society is not a patriarchy. Even if current society were completely equal in how all residents are treated regarding access to education, careers, wealth etc, there would still be thousands of years of catching up to do before under privileged groups would actually become equal.
It's like starting a race with all the men just a few feet from the finish line, but the women having to run a marathon. Just because you all start at the same time doesn't give you an equal chance. The only way to resolve it is to put people into equal positions. So, insist on ALL jobs, however privileged or otherwise, having a 50/50 balance, which is completely impractical to arrange.
Also, how that hierarchy is formed is also relevant. If people become 'leaders' by proving their worth, taking on responsibility, helping others, that seems ok. if they do so through violence, corruption & manipulation, all to serve themselves, that is a serious problem. i don't have an issue with a hierarchy which is there to organise, help people (eg work places where someone needs to make decision, be key contact etc). within personal relationships i don't think there should be one, we are all entitled to equal respect, voice etc.
btw, when discussing these ideas, i think we need to make a clear difference between theoretical separatism, and real-life examples.
real-life examples also include convents, which would, one assumes, have a different type of inmate, than a female prison. there is very strong evidence that the environment of a prison itself creates violence, so not a good example for any discussion except whether prison leads to reform or re-offending.
As i write this, I am acutely aware that all of these points are just as relevant to racism, poverty etc, and that 'society' is too big to be reformed just around one issue.