Therefore, claims like “women are X; therefore, women shouldn't be allowed to do Y”, insofar as “women are X” would normally be taken to refer to typical women and “women shouldn't be allowed to do Y” would normally be taken to refer to all women, sound a lot like fallacies of equivocation to me.

Or maybe the claimers do not believe that every rare exception warrants a deontological obligation to create an entire legal/social/institutional framework to acommodate it, regardless of consequences such as horrible inefficiency, toxic social pathologies, or the abandonment of vitally important Schelling fences (I am reminded of a comment on Steve Sailer's blog: "The military is too male. I don't have a joke, I'm just really in awe of that phrase. I'm thinking about the length of a journey that a culture must undertake in order for that to stop sounding crazy.")