> 1. Most adults are literate — When kids have questions about letters or words while they are teaching themselves to read they have a huge supply of adults and older children to get help from.

I had first grader during corona lock down and I can tell you that ability to read/write does not imply ability to help the kid to learn to read and write. This part about kids learning to read by themselves and by asking question of adults around of, frankly, complete nonsense for wast majority of kids.