I agree that Apple TVs in classrooms is a waste of money, but I don't remember text books being particularly useful, either. We covered between 25% and 50% of the contents of the book, and maybe had assigned reading for half of what was covered.
Textbooks are also a bit of a racket, too. The contents and pedagogy generally move very slowly, but legislators and parents like to micromanage contents, and textbook makers are happy to oblige. The number of, say, algebra, books across the US is probably embarrassing, as is the fact that there isn't a movement for public domain textbooks.
Novels are different. With 5 books per year at $4 per book with books lasting a few years, I'm less concerned.
This seems like that on greater scale.
More granular mastery-based progression seems like it would be a good start.
I remember my time there being effectively day-care, I learned more outside of class than inside it. The only real benefit was socializing with kids my age but otherwise everything I learned in those 2 years could've been taught in a week.
What I’m trying to say here is that if we push kids without telling them “this is so hard, you might not be able to do it”, they might just do it. If we pushed the gas a bit further in the content we teach, not only we’ll get people learning more and faster, but also they might get a better sense of accomplishment.
In her school there is 1 math and 1 reading specialist, who are meant to focus on kids like this. Now they need about 5 more of each but the district has routed funding elsewhere like the Olympic quality weightlifting gym for the high school football team (which is used maybe 1hr per day). Better stop, feeling like I'm about to start ranting again...
There's also a decent amount of conceptual math taught in these grades. I wouldn't say that the concepts are 'hard', but they do take repeated exposure for many kids to grasp them and perform them accurately. You could teach the skills in a week, but only very bright kids would immediately pick up on all of it and not need further practice to be on par with kids who attended K-2. For example, it takes repeated exposure and practice for kids to know that a number ending with 4 and a number ending with 6 will always sum to a number ending in 0. Or to know their multiplication tables.
Does it take three years to learn this stuff? No. But it can't be crammed into a week or even a month.