Ed tech, like most tech, is primarily focused on making money for the ed tech companies and their shareholders. Not at all surprised that it doesn't actually lift education standards.
As the parent of two kids in elementary and middle school, the one thing we learned from Covid is that children need live teachers. Yes, there are exceptional children who can self-teach with good materials (I have one such child) but most don't. And for those who do, you don't need fancy tech. I supplement my (advanced) child's education and primarily use books and pencils, and live coaching, as I've found those work better than any "adaptive" EdTech I've encountered. Finding it too easy? Just skip pages to the next chapter? Too hard? Find some extra review problems on the topic.