Why should we assume that equalising educational outcomes across regions is primarily contingent on investment?

www.bbc.co.uk/news/education-60213729

Is there less state investment in education in Hackney than Winchester? (I genuinely have no idea; but it seems to me a relevant question).

I suspect we would primarily level outcomes by "improving" the families a lot of kids are growing up in.

But this sort of comment is deeply frowned upon these days. Yes investment may help a bit; but I suspect not much more.