Great points! Interestingly enough, "born this way" is an argument that probably resonates most strongly with queer people like me.
I'm a cisgender gay man who has never experienced significant sexual or romantic attraction to women. Like many gay men in my shoes, I came to know I was gay when I was a small child. By the time I was 11, I had a name for what I was feeling. My personal universe was ordered around the "innateness" and immutability of that.
For a very long time after I grew up, I had no concept of queer experiences outside my own. I didn't know queer women are more likely to experience sexual attraction as fluid. I was somewhat aware of the trans experience, but not at all of the nonbinary or gender-fluid experience.
Bisexuality was a concept I barely grasped, because it wasn't something I could personally imagine.
Yet, my personal experiences represent only a minority of experiences within broader queer communities.
It's possible my homosexuality was set in stone while I was still in the womb or shortly after I was born. But even if that's true, it says little about the majority of LGBTQ people.
Bisexual people, gender-fluid people, and non-binary people present a philosophical challenge to those who would lean too heavily on the Born This Way argument.
Bisexual people, for example, make choices in life, choices about sexual / romantic partners that conservative elements of society say are morally wrong.
"Yes," says the hypothetical religious minister to the hypothetical bisexual woman. "I know you sometimes feel strongly attracted to other women, but you also feel attracted to men. God wants you only to act on your attraction to men."
Born This Way, as an argument, offers little to help this woman answer the religious leader or the questions she finds within herself.
She needs firm grounds from which to insist that her moral choices are appropriate and good, whichever gender of person she chooses as a partner.
Similar weaknesses with the Born This Way argument exist at various levels throughout queer communities.
So, thanks for raising the issue. It's definitely something we need to be thinking about, especially since cisgender gay men like me often can't rely on our personal experiences to guide us.