This last section with the practical example is the cherry of the cake. It helps widen the conceptualization taught in the course, beyond common grounds. People have different way of learning and the more approach you offer, the better. I have had a short journey in Data Science, yet it is evident that practice plays a huge part on it. Such activity takes you from 0 to 100 and greatly increases your confidence in the subject. Food for thought: I don't know how plausible it is, but if the same could be applied for the career track courses, where we could have all subjects wrapped up into a big work, that would be exceptional.