wouldn’t the follow up to that be along the lies of…but this shouldn’t be a conscious effort and ground contact is representative of a number of factors.
Its like saying golf coaches agree the key to long straight drives is the clubface being square at impact and moving fast. Yes, but there are a whole lot of other bits that go with it and allow that to happen.
IMHO one of the best analogies Charlie gave was trying to spin a wheel with your hand, to make it go fast you skim it, if you consciously try and push it hard then it goes slower.