I fail to how gender is not part of who you are as a human, if you have read ghost in the shell you should know it does explore sexuality/gender.

And you're mixing up action with identity, a straight person can identify as straight while not act on that identity, the whole "its not a choice" is the counter argument to society at the time demanding that LGBT people "straighten up".

It's not some LGBTs foundational argument.

> I always wondered how the LGBTQI++ community will react when transhumanism allows all their sexual identities to become a choice. Will they still insist that they have no control over it?

If there was a simple pill that cured gender dysphoria, a pretty reasonable number of people would take it.

I read current gender rhetoric as a necessary counter culture that got adopted too readily - only in the sense that it seems like we should have detached from any sense of discrete categories, and now we have to overcome the current doctrine to get to a more flexible and sometimes healthier place, where the culture can become about this kind of self discovery you mention. At least thats the arc I would write if this was fiction, maybe this kind of speculation is unhealthy in this forum...