It would probably help if you could tell us with any certainty what "certain way" describes how women tend to look and act.
How about this: go outside to some well trafficked public area and then at first try to determine whether the people you see look like a male or a female human, then afterwards ask them whether they are male or female.
It also seems to me as if a certain amount of prescription is necessary, at least on an indvidual level, for transsexual presentation to work. "I have to look and act a certain way, in order to qualify as a woman in my own head. I have to look and act a certain way, in order for other people to properly see me as a woman."
Practically speaking here, people who are trans try to look and act like people of the opposite sex tend to do. Obviously females tend to look and act in many different ways, and yet it is also obviously true that they tend to look and act in a certain general way compared to males. That's why we usually don't need to inspect people genetials to determine their sex.
You keep pushing this false dichotomy between either treating "woman" as a synonym for someone of the female sex or it being just a completely meaningless label that can be applied to anything. There's no reason to limit yourself to those options.
Meanwhile it is exactly this soft prescription that feminists have been trying to get away from.
Except that these "gender critical" feminists tend to have a lot of very strong opinions about how transwomen do not meet their standards of what a woman should look like and how transwomens appearance is an outrageous defilement of womanhood.