Gender is enforced for the sole purpose of one class to oppress another.
The same way that slavery maintained that black people were inferior, and therefore it was perfectly ethical to use them as unpaid labourers.
Gender is harmful to women. It is beneficial to men.
Men who transition to women do not take on any of the negativity produced by female gender roles.
They are not exploited for their sexual or reproductive labour. They have no investment in fighting for the rights that pertain to women's biology. They clearly have no understanding of, or support for, women's boundaries, otherwise they would not be campaigning to remove them.
Whether you think gender identity is innate or not, the reality is, it is nonetheless the biological lived experience that counts.
If you accept that transwomen are women, to all intents and purposes, and need to be included on that basis, you also have to accept the feminism is pointless.
You also then have to accept that a male body, despite being different should be accepted as female.
Which makes almost everything that women fight for completely redundant. Because women's rights are based on their biology.