Books and Screens and Kids' Brains

The PISA survey has shown that there is a clear correlation between adolescents' reading literacy and the school system's requirement for reading a few books with more than 100 pages. In addition, several meta-studies have shown that longer informative texts are better understood when read on paper than on screen. Nevertheless, in many countries, digitisation is being accelerated in the primary and secondary education system, without considering the link between the reading substrate and content comprehension. Even worse, in many universities, reading of longer texts has been dropped from the curricula. Why is there such insensitivity to statistically relevant insights into the importance of reading longer texts, usually called books? What are we as a civilisation losing by this? Is there any relevant substitute for long-form/book reading? If not, what are we losing by all this? What can education publishers do to offset the negative effects of digital media and enhance the positive ones?