As such, while you and I may have some idea of what we think a woman is, it's not really something that can be given a concrete definition the way these people seem to think it needs.
The meta of gender is simply the way we see eachother and not something that can be measured. It's felt.
It's a lot like trying to build a concrete definition for intelligence. What is intelligence? How can it be measured? IQ tests are one way, but they're pretty much universally regarded as inaccurate at best.
Whatever intelligence is, these rage baiters don't have it.
I agree. the only thing that we can say scientifically is that someone has a specific amount of traits we have associated with the social label 'woman'. These traits are biologically speaking primarily related to reproduction and which role one would be able to fulfill the most effectively. Which does leave room for being able to fulfill both reproductive roles in some way or another.
Our social needs to mark ourselves and others as one of the two is deeply ingrained, but as it's such a grey area under the hood it would make sense to have a more fluid relationship with the topic.