So the schools are doing their job properly, instead of relying on upper-middle-class native English speaking parents to do all the work. It is impressive.
I think it's partly because political conservatives are more often right when it comes to education, because they don't listen to the experts and just demand boring conservative things like phonics, learning the times tables, learning facts, and other stuff that "doesn't really teach you how to think".
Just have a look at what the Harvard Education Review thinks is important - https://meridian.allenpress.com/her - no that's not a parody site by someone who uses the word "woke" without scare quotes.
Progressives listen to experts, and the experts in education are often a bit ... scientifically lightweight. Teachers are not all brilliant at scientific research (nor do they need to be, and expecting every teacher to be a scientific researcher would drastically limit the talent pool, or require a very significant salary bump to get more candidates), so universities need to cater to the lowest common denominator, which makes teaching degrees mostly a course in using education jargon to write persuasive essays.
If you have scientifically lightweight uni courses, you tend to get a lot of scientifically lightweight researchers, who are far better at writing a persuasive essay than actually looking at evidence. And with a critical mass of lightweights, they don't really want education to move into a more scientific or evidence based footing, because then their own influence and maybe even careers will be harmed. Yes, there's good education researchers, but most of them work in Psychology departments, not Education departments. Or special education, which is a bastion of sound evidence based practice, for some reason, probably because like teachers in red states they actually need to do their jobs properly, and can't just rely on demographics to do all the hard work.