Lots of programs are set up in a pick and choose manner so that learner can learn what they want to learn in any order. Sounds good but it doesn’t guarantee the learner will make good choices. This video from the Karate Kid illustrates the issue. How many people when they start to learn Karate would choice waxing the car, painting the fence and sanding the deck. Probably none. But the expert says, that’s the best way to learn it.