Because it matters for the health and safety of children.
This is mumsnet. Most of us are mums. Mums are protective of children and so are interested in safeguarding them.
All of the sexual assaults and voyeurism (inc hidden cameras) in school toilets are done by men or boys. Overwhelmingly on girls.
The deaths in school toilets due to medical emergencies are girls and boys. What matters here is the cubicle privacy because it affects how quick children are found.
The Scottish government have not analysed what happens when you make toilets private. They have not done risk assessments or equality impact assessments. If they had, they would realise the ‘privacy’ they parrot out has led to situations above.
It is well known why we have door gaps in toilets. Yet they go on about privacy NOT health and safety.