only that which is fardh ayn is wajib not everything in the darul uloom. & since it is fardhu kifayah to have people reaching this level then one person in a comunity only go & its better that it be a man. some ulama have written articles about the evils of aalimahs in south africa. not that they evil but the problems with alimas. one thing that was mentioned was that never did a women live in a darul uloom in the time of sahabah & tabieen.