[tbt]

It rarely helps with learning vs. natural counterfactuals. It harms by socializing kids to not believe that their own curiosity is hopeworthy.

See John Taylor Gatto's work.

Instead of inefficient spending for large, programmed classes, you should have daycare/day supervision with lots of resources (books, internet, age-appropriate tinker equipment like electronics and tools and so on, microscopes, telescopes, a few adults on hand who are experts in whatever topic to help kids get traction / navigate), more free-rangness, less authoritarianness, more mastery learning, more apprenticeship.