I’m Danish and not at all interested in the politics of it, but there can be a case for teaching algebra late. We do it in Denmark, because it’s the subject children have the hardest time learning, and having too many of them fail too early kills their interest in math. We still teach algebra in grade 7-9, but we’ve gone through the social experiments of teaching it at different ages, and have lost entire generations…
It would be great though. I loved going to school for the first 4 years when we were ~30 people in the whole school (spread over 1-4th graders) - the teachers were able to address individual needs. Then I went to fifth grade where were were 35 people in the class. It just went downhill from there.