Some answers on this site are kinda thin on the "why" it works. Sometimes its obvious and does not need an explanation, sometimes the explanation is there but sometimes its missing.
The questions here usually go like "how to do X" and an answer "Do it like this" would technically answer the question.
Now I have the feeling that an answer coming from a lifehacking expert should contain a "why" as well so the rest of the world can not only learn what works but also why it works and apply that knowledge to other similar stuff.