Scomo has been over simplifying/misleading about schools from the beginning.
In his first messaging, he actually said closing schools would make the spread of the virus worse.
We started to get a handle on it once school holidays started.
Forget that there's a thousand plus kids at a lot of city schools. You could even forget that there's a hundred plus staff members (not just teachers - ES staff are normally forgotten in all this).
One of the big benefits to having schools closed is the reduction in all the subsequent travel. Parents dropping kids off, kids on public transport, high school kids travelling far and wide during lunch times/free periods/after school etc.
Plus there's the big one: attitude. As soon as schools open, there'll be a lot of 'Well if I can be around a thousand people at school, surely I can hang out with my ten mates afterwards.' And it'll be hard to argue with that.
If they open schools then as Ezy said earlier I will be relaxing my social distance measures too. Can't have your cake & eat it.