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The loop is not (usually) executed sequentially, in nature or in human tactical training.

Boyd’s thinking was useful in the military bureaucracy to make the right types of aircraft that would support high maneuverability and rapid decision making. Training to excel in use of new aircraft only came naturally to the pilots to a certain point, and this is still true today.

However, it’s true that OODA skills like rapid re-orientation are often best taught to humans by putting the right kind of pressure on them so that their instincts will be honed in a useful way, although mastery requires thinking about and tuning those instincts as well.