I won't go so far as to call them irrelevant cause I've personally found them very useful during my education. Whilst they're useless by themselves if the quality of the content itself is useless they can definitely help studying more easier and efficient.
There's this study by the OECD which finds that not only there is no correlation between maths/reading/science skills and the use of computers, but in some cases using computers only makes things worse:
https://www.bbc.com/news/business-34174796
https://www.compareyourcountry.org/pisa-digital
In France they recently completely banned tablets and phones in primary schools.
Estonia, Finland, and Singapore have some of the best K12 education in the world and they barely use computers if at all.
The evidence is slowly piling up that learning, at least until before college (where most of the cognitive skills are learned) does not benefit from using digital tools.