Computers as a tool for educational purposes is different than a TikTok stream.
Adults using smartphones is different than children using them during learning periods. And for what it's worth, adults should use them less during work hours. In any case, this bullet point is no justification for letting kids use social media in school.
Corporations locking down work terminals is legally permissible and morally correct. Unless you like the idea of a computer illiterate bank teller downloading zero days to the internal network because they have some fundamental freedom to browse the web on company resources.
It isn't totalitarian, I disagree completely with the use of that term and with the implication that teenagers should have franchise at any level above local. Yes, school for children has different expectations than adults in an open society.
It is about games and social media.