"If we agree on the effects of estrogen"
A) we don't agree. A weaker man is still 'on average' bigger and stronger than an average woman.
B) we have explained until we are blue in the face, until the cows came home (and went out again) that it is not just about physical risk, it is also about dignity and privacy and being triggered by the sight or sound of a male in what should be a female space.
C) TRAs won't let us draw the line anywhere. They won't say 'yeah OK fairs fair if you let us in to yoga we will stay away from rugby' or 'of course it should only be surgically transitioned transwomen that get to 'be' women' or 'hey tell you what give us the validation of toilets and we will keep out of changing rooms'.
They want all of it, every last bit so there is nothing females can have to themselves. Not 14 year old girls in tents at guide camp, not prison cells, not words for our unique bodies nothing. And they don't want any conditions, any limitations, any requirements on which transwomen can have it.
The law says they can't have it so stop wheedling. Men are not women and women's things are not for men.