I understand this perspective, really I do. I have a hard time understanding how there could be a spectrum. It doesn't make a ton of sense to me either. I've gotten into heated arguments in the past about it, not because I say it is wrong or bad or whatever but because I am not confident that we as a society, including the scientific/psychological/neuro-cognitive whatever brain geniuses, know nearly enough about gender to say for certain one way or the other that gender is or is not binary. Simply put, I have no clue, and I have no clue how anyone else can be so confident about it. We question the sanity of people that want to cut their own arms off, but not people who want to cut out their reproductive organs. Makes no sense to me. I don't get it.
BUT
What the fuck do I care? It has nothing to do with me in any way whatsoever. If other people want to do this, by all means have at it. Fill your boots. Be whatever gender you want. I should have no say whatsoever in whether or not you identify as anything. My opinion is not relevant. I fully support people's rights to choose whatever it is they want, and then live that life happily. I don't have to "get it" in order for that to be the right thing to do.