I'm one of the people who find LLMs extremely helpful from a learning perspective, but to be perfectly honest, I've met the children of complete "luddites" (no tablets, internet on home on timer for school work, not allowed phones until 16, home schooled, house filled with a million books) and they honestly were some of the more intelligent, well-read, and thoughtful young people I've met.

LLMs may end up being both educationally valuable in certain contexts for certain users, and totally unsuitable for developing brains. I would err towards caution for young minds especially.