People need to be free to be transgender, Obviously.
Forgetting/dismissing biological differences is damaging to society as a whole though.
I would be more convinced by so-called "Gender fluidity" Once a male-born person, for example, chooses to present themself as a Woman, call themself "Miss Cathy Braithwright from BraithTown", has breast implants, big hair, shiny lips and patriarch compliant, but still recognises and understands they are a man.
Likewise a FTM should absolutely be free to present themself as male with breast reduction, hormones whatever so long as it makes them happy while still respecting their own biology in certain situations.
SUCH AS medical diagnosis. In segregation of the most vulnerable in prisons and crisis centres. In refuge. In reporting m/f statistics.
In sport (because born men are stronger and taller and have physical advantage)
In many areas where biology needs to be truthful.
Being asked to set aside biology in favour of "gender" is fucking ludicrous.