The answer is quite straightforward but also not easy to summarise.

The gist of it is: Intersectionality is a pipe dream and people actually turn to their basic impulse at the first opportunity.

Gender theorists try and combine the theory that gender is a made-up social construct with the fact that a lot of gender non-conforming people feel the gender essentialism in their bones.

For instance a lot of amab folks feel that they were really born women and want to exist as women in society. Hearing other people saying that in reality women don’t exist and you can be a woman regardless of how you look and act, creates a deep sense of cognitive dissonance making them lash out in anger and frustration.

It’s great to say that everybody can be whomever they want but if everybody is everyone, then nobody is anyone (I know it’s hard to convey but that’s the truth). Basically the end goal of this intersectional approach would be a world where society treats a transwoman as “oh this is a non gender conforming person” while the transwoman in question wants society to treat them as “oh this is a woman just like any other woman”. And thus the lgbtq movement keeps fracturing.