Thought experiment: you can ride a bike. You can see other people ride bikes. Some portion of people get on a bike and fall off, then claim that bikes are not useful for transportation. Specify what skill they are lacking without saying 'ability to ride a bike'.

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quotemstr 6 days ago | parent [-]

For a bike? Balance, fine motor control, proprioception, or even motivation. You can always break it down.

	▲	Eisenstein 6 days ago \| parent [-]
		Knowing those things won't help them acquire the skill. What will help them be able to ride a bike is practicing trying to riding a bike until they can do it.