Time is money. We will need to make sure we use the correct skills to help us achieve the best result in an efficient way. There are many ways to get things done but it comes down to one crucial fact, "which method is the best and fastest". In this case, time should be spend on what the learner will "need to know" rather than less important content such as "good to know". By doing this, not only it saves time and cost but also avoid cognitive overload.