Education research is really low quality. Like so many other fields in social sciences, the results rarely generalize beyond the direct findings, and only support the hypotheses in the mildest way. It cannot robustly guide decision making.

The fact that studies on screens vs books cannot get a consistent answer says enough. I checked #3 of your links, and the amount of bullshit is astonishing. The cited articles offer vague, unresearched explanations for contradictory findings, or point at differences in the stimuli, something which should obviously never have happened. After some cherry picking, article #3 treats the remaining studies as equal and reliable enough to throw in a big bag, as if that solves the problem.

Think of it like this: the replication crisis in cognitive psychology was found trying to replicate some of the better studies. The average education research study is several levels below that. It'll have a replicability of 0.1 or worse.