Open debate - we've been here for years, pushing for that. There's been much screaming and rape and death threats as a result. A nice open calm debate takes two sides with the capacity for calm and reasonability. Women tried: we can't do it alone.
To make progress with a middle ground would require two sides capable of equal care for the other groups' needs, feelings and best interests, and willing to support those to be achieved. Again, #fail. We've tried. If you can find any activist or rep of the political lobby driving this with the faintest interest or care in the needs of the female side of the equation please do share, because I can't and I've been at this now for years.
Middle ground - well that was the GRA. A very small number, gatekept, fully transitioned or in the process of, in women's spaces. Women not consulted, asked, and no attempts made to consider or track impact incidentally. That middle ground has been abused to the nth degree. Middle ground now in effect means taking still more of women's rights to give to men.
It's lovely that you personally find mixed sex toilets accessible and satisfactory, that's great. But my concern is for the women who can't access these. Excluding women so men can have more freedom of choice isn't an answer that works for everyone and I'm not ok with that inequality that turns out to be sex based. No one incidentally is looking at suicide rates for women, particularly the vulnerable groups, or how the number of things like domestic violence deaths have been affected by some women in life threatening relationships not being willing to accept help from a refuge or women's services because those spaces are now 'inclusive' of men and so exclusionary of women with specific needs. Those women's spaces no longer do the job of being accessible and inclusive of all women.