[LiweiZ]

People need concrete context to get the knowledge? Most of us start with doing other than having the big picture? Most of tutors need to provide some taste in real world to learners to make them pay since programming is actually very practical? My guess is that these could be among the ones of the main reasons. Well, there are of course some motivations from educators' side as well. Maybe too simple and straightforward is not a good thing. I'm not sure yet.