From her How to Suppress Women's Writing
"In 1837 Charlotte Bronte wrote the then poet laureate, Robert Southey, asking his opinion of her poetry. Southey answered
“that it showed talent” but “advised her to give up thoughts of
becoming a poet”: “Literature cannot be the business of a woman’s life and ought not to be. The more she is engaged in her proper duties, the less leisure will she have for it, even as . . . recreation.”"
My review; Society have long been used to suppress women writing and setting prohibitions is one the safest way to do it. Russ, with her book, is making the readers aware of the limitations. As you can understand from the quotation above, discouragement is a form of prohibition.