What Ed-Tech companies? This article isn't talking about Ed-Tech companies. Axel Rauschmayer isn't an Ed-Tech company. He's an individual author who wrote books about JavaScript, the language. He wasn't pushing these "unnecessary solutions", he was helping developers understand JavaScript, exactly the thing you say is necessary. Josh W. Comeau isn't an Ed-Tech company, he's an individual who writes content about new CSS features like Anchor Positioning[1]. What do educators like this have to do with 1+ GB RAM frontends?
[1] https://www.joshwcomeau.com/css/anchor-positioning/