I read somewhere that class size has a very tenuous link to performance. It depends on a whole list of other factors it seems. I would say class size requirements are another case of top down mandates overruling decisions better left to individual schools.
I don’t understand the desire to close school districts and force kids to go to failing schools. If we free students to go where they wish, and we will have a nation of much higher performing schools.
Brookings is left of center these days right? Either way, it covers some interesting studies.