That’s fair. But if there’s a problem with the clarity of body language, whether it’s for all genders or just one, why would the answer still be to rely on body language? Why not achieve clarity through language?
Reasonability is always a factor. A certain marginal number of people are going to be unable or unwilling to “get it” no matter how clearly/explicitly it’s presented to them. But if we’re saying that the majority of an entire gender is just not great at receiving a certain set of signals, then it doesn’t seem very reasonable to continue to rely on that set of signals for clear communication.