What is a woman?
Anyone who says s/he's a woman.
What is a man? (Rarely asked, but still)
Anyone who says s/he's a man.
So this means reproductive category - aka biological sex - has absolutely no bearing on whether a person is female or male.
This is, indeed, what Stonewall & Pink News tell us.
Now let's consider the matter of single-sex facilities. Why do they exist?
Privacy, dignity, safety, fairness.
These considerations are tied to reproductive category.
The egg-bearing category has a greater need for protection relative to the sperm-producing category, but those also require protection in some circumstances.
Up to now, therefore, some services, spaces & opportunities have been reserved exclusively for one reproductive category or the other. This was fair.
Now we're instructed that reproductive category has no bearing on the matter. All that counts is whether you say you're a woman or a man.
This being so, both women and men may be either sex.
So there's no need for single-sex facilities, etc.
It makes zero sense to have two of everything: one for people of both sexes who say they're men; one for people of both sexes who say they're women.
Everything can - indeed, should, according to this doctrine - be mixed-sex.
More egg-bearers will get sexually assaulted; more of both categories will self-exclude from sensitive environments; no egg-bearers will make it as athletes.
But it will be cheaper, which I suppose is a plus.
Stonewall & Pink News will be happy ... won't they?