I sort of think we are too hung up the 'binary' notion of how to categorize all of this.
Like 55% of my hookups & longterm things have been with men, 45% with women (those were a little more short-term, like a year or two or three, so some counter-balance to the equation, but no less emotionally intense...and some endure in some form to this day).
So who knows why this 'orientation' thing merits our attention? Live the life you find at every moment as you find it!
And choose your partner in the moment as you find him/her/trans-him/trans-her as you find a mutually fulfilling compatibility.
What is so difficult about that?