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All children learn to walk and to talk without being forced to. Many children learn thinks from programming to producing music to languages to science without being forced to. Adult learning is also self-directed.
If somethings interests children that's a great indication that it's something they're going to be good at.
Children are naturally curious, that they need to be forced to do something is a strong sign that it's if not total bullshit at least not important for them.
Most things you learn in school could be replaced by anyone with a computer.
They won't learn to socialise with each other
These children will not have any work ethic at all.