It's certainly true that some children (and indeed, many adults) do not seem to have the ability to learn from computers, and the computer won't do anything about that (where a human teacher would identify the children who cannot learn from them and can do something about it).

Learning from computers is a skill like any other; is that skill taught first? I wonder if there's an unrealised assumption that everyone can simply sit down in front of a computer and be efficiently educated by it.