Some of us don't want education to be state-based. We want the entire country to have strong public education and funding with specifics handled by locally elected supervisory boards. We don't want people like MTG or Boebart or Abbot or DeSantis dictating it: banning books, whitewashing American history, deciding who gets funding and firing professors, and sabotaging the entire system with voucher garbage to benefit their rich private school buddies. Just because I disagree with, say, Kentucky, doesn't mean I want them to suffer third world education and destroy a generation of outcomes in their state.
(3) is a downside to us. Nobody in politics is debating the specifics of how children learn algebra or what drives outcomes or how to prompt reading. They're debating the "values" if trans kids get to go to the bathroom or participate in extracurriculars. If we call it the Gulf of Mexico or America. If you're even allowed to teach about civil rights/history, in places like Florida. Education systems should be higher to keep it out of reach of tiny men, in an independent agency that has no interest in values and has oversight from an amortized political view (legislation).
Your other bullet points don't really make sense. (1) isn't related to states, it's related to teaching policy, and it's policy that states currently control. (2) is not changed by this at all, it just moves the bureaucrat to a smaller region and near guaranteeing that they're led by a biased, agenda-driven politician (purple states are rare).