This has, indeed, been discussed over and over (although, to be fair, the search facility on here is so dire that people can be forgiven for not finding anything). As wit most things, posters do not speak as one about it. Personally, I think that if someone has undergone an operation (or series of operations) to become a woman, they are in a very different category from those with ‘feelings’ that they are women, and different again from those who chop and change. I don’t think they are women, but I would certainly refer to them as ‘she’ and see them as honorary women (with no disrespect meant by that).
I am not happy to go along with someone’s vague ‘feelings’ when it comes to allowing changes in the law, or in diminishments of women’s rights, however - I would want much more of a commitment than that.