Danny,I can't imagine learning or teaching like that. Did you know that many people learn to float before they swim? And even before they float - some walk in water practicing the arm motions needed for swimming. (Something that is purely physical - which piano is not)
And say, did you know that it was Jack that walked up the hill? It wasn't Mr. Complicated surnamed Expialaexpidotious who trudged uncertainly up the serpentine trail and by much forethought and determination reached the zenith of the small mountain.
I do know. I just doubt it works or that it has been proven that it works or does anything except delaying the only useful thing you can do. There are controversies about the science of learning, many believe know that step by step learning is an error and that we indeed learn by full immersion and practical trials with things that are too "difficult" for us.