Do you realise that by saying trans woman should be allowed to use a lady’s toilet that that creates more dangerous toilet designs for everyone don’t you?
It means there is a huge economic cost to venues to create toilets that are more dangerous for anyone who has a medical emergency, that have been scientifically shown to be less hygienic (more cleaning and ventilation problems) so you are more likely to catch pathogens, and are particularly dangerous for women and children.
Changing toilets to the mixed sex design means they have to be fully private and sound resistant (they lose the ~10-15cm gap at the bottom of the doors/partitions and the space above it). They need a sink and hand drying facilities in them. This is costly and requires more maintenance. They need monitoring more. There are less toilets per person and people spend longer in the cubicle washing hair, doing makeup but also inappropriate things too. ‘Sex, drugs and rocking the bowl’ as one toilet researcher put it.
Toilet design absolutely affects everyone at their most vulnerable. It affects children, those with disabilities and long term health conditions, those having a health crisis (mental or physical), elderly and people of certain faiths the most.
Trans people are not immune to being medically vulnerable. They are also safer in single sex designs. But their presence in the toilet of the opposite sex, means the toilet design has to change for everyone.
I look at toilet fatalities and assaults and single sex public toilet designs that have door gaps are the safest and healthiest design. These still need to be the default design. But it means you need a single sex space in front of the cubicles. It means everyone sticks to the toilet of their own sex.
I want everyone to be safe.