I am extremely uncomfortable with (for example) self-certification being open to abuse but we need to work on ways to prevent this whilst still acknowledging that there are people who need support with their identity as it relates to their position in the world.
Given this and everything else you have posted @thatonehasalittlecar I would guess that you are where I was about 5 years ago.
I know both transwomen and transwomen and I don't want to think if them negatively. They are longstanding friends.
But about 5 years ago something changed for me. It was the aggressive insistence that women had to step aside, to willingly give up those legal protections that made simply living my day to day life more safe. Like participation in female sports the presumption that any man could use any single sex space meant that some women would be hurt and excluded from all areas of life.
I had to think about that. Even if I didn't consider men who deliberately set out to hurt how many women excluded from a club, a swimming pool, elite sport, an award for literature, a job was too many? How many women hurt, injured in a sport was too many?
At that point the reality of 'cis' became obvious, it obfuscates what is really happening, just as the terms transwomen does - Look at many if the opinion gathering polls and you will see that lots of people don't know, and assume a transwoman is a female wanting to be make and vice versa. That cannot stand. Nor can any other assault in language that seeks to hide the damage being done to the every day dignity and safety if women.
Keep posting, keep thinking. What is the end result of what you believe? Seriously consider that, you may well end up being as horrified as I was.