I think it’s because in frum families, women tend to make much better mothers than men make fathers. In plenty of frum families the father does not wake up with crying children, does not change diapers, does not go shopping for food or clothing, does not cook, clean, or pick up kids from school, or help them with their homework. Instead men are (ideally) spending their time earning or learning, and much of the home-life is organized by the mother. Rebbeim in yeshivos can thus refer to their talmidim as future rabbanom, lamdanim, etc, because for many that is their primary job. Calling them fathers/husbands would just ring hollow.
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