I strongly disagree. I am only happy for people to be the best version of themselves and to feel comfortable in their skin.
Changes in legal or morphological sex is not relevant. This is not what we are discussing.
I already mentioned that there are edge cases. Edge cases do not discredit foundational frameworks that define reality.
The bio-chemistry of terrestrial life is built upon a binary sex framework. This has been true for hundreds of millions of years. There is no such things as a triple helix or quadruple helix in terms of reproduction. Even trees and plants have a binary sex.
You claim that this is something I want to be true. I would argue the same (on a vice versa basis) for you and that you're framing the discussion using irrelevant examples (how is a morphological change in sex even relevant to what we are discussing).