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What you're really seeing is that Wikipedia has significantly more women-focused WikiProjects than men-focused ones.[1]

For each "Wikipedia:WikiProject *", you'll find a "Category:Top-importance * articles", "Category:High-importance * articles", "Category:Medium-importance * articles", and "Category:Low-importance * articles".[2]

In the case of "Category:Low-importance women writers articles", WikiProject Women writers has assessed that an article in the category is "not very significant within the general study of women writers or literature".[3]

Meanwhile, there is no WikiProject Men writers, so it should be unsurprising that there is also no "Category:Low-importance men writers articles".