Isn't it the opposite?
I don't know if you've seen curriculums recently but they are totally about individualized education. Between IEPs and 504s, accommodations are made for nearly anything now. Students are put all into one large class, no more AP, Advanced, Standard because this caused hurt feelings for kids that could not make the advanced class. Students are pooled and the rationale is the more advanced students will help the less advanced students (!).
What this means in the classroom is teachers can not go as fast, advanced students get bored, every person has their own INDIVIDUALIZED test (3 instead of 4 questions, no write in questions, landscape instead of portrait, etc). This drives teachers absolutely insane and they cannot teach at any efficient level. Grading is so bad, teachers structure their course to have less exams because grading ten different quizzes and exams cannot be optimized.
A lot of this is parents disbelief that their little Johnny is not the next einstein so they torment teachers via policy hacks to give their children advantages. Admin doesn't care because they'll just fire "low performers" lol.
There is the above problem, and then there are the revisionist math ideas that common core and friends produce better outcomes instead of "rote" math. Well, math has been taught via rote for decades, possibly centuries, and people under that scheme learned math in a way that they became draughtsman and scientists, so maybe there is some proof in the pudding. My friends who did common core are barely math literate, can't calculate a tip even if you give them the hack: move decimal left by one place and times by two.
Before you come at me for being ableist, remember that this means even with these accommodations people are doing worse.
Also, no phonics?! Wtf?
People <25 in normal jobs (retail) cannot do simple fractions of 1/2 and 1/4.
Something is wrong. I'm not saying these guys are right but don't blame standardized education which was systematized in the 70s-90s just yet. I would posit that hostile admins/policy, dumb revisionist ideas that have no basis in history, and NO NATIONAL CURRICULUM. Why we do not have a national curriculum seems crazy to me, but there must be some reason. Surely we can agree on that at least.
I agree with you that right now is the best time for individual augmentation for education, and we should wield that power for good. But I do think it can be in service of a system.
EDIT: just realized this is a blog post length, sorry. It is one of my pet issues, n=3, mom works with people at deli that cannot do fractions (they get fired, up to 20 so far), teacher friend 15y in history has to make custom exams, and publisher friend who sees young writers (<25, n=??) can't sound out words.