And the field you mention seems to be where people who identify as "Questioning" would fall.

I think where usage of the word "choice" becomes problematic is that some people have difficulty distinguishing between "the choice to be open about one's sexuality and openly self-identify" versus "the choice to be attracted to one or more genders, sexually." Obviously, you and I are talking about the former. The latter is manipulated by right-wing zealots, either intentionally or ignorantly (misinformed).

I'm not one of those people who believes in the strict gay/straight binary, or even who applies rigid parameters to bisexuality itself. There's definitely a spectrum. My thing is: we can't second-guess other people when they know themselves well enough to acknowledge where they fall on that spectrum. "Oh, but how do you REALLY know that's the way you are?" is a variation of sexual gaslighting.