Let's say that I want to ask a simple question like "How are planes able to fly?" or "Where on the internet can I find the list of all presidents of USA?". Asking these questions I'd have to add a description because otherwise I get the error:
Body is missing.
What if I have nothing to add? Should I repeat the question? In my opinion adding why I need the answer to these questions is useless and clutters the thread.
Edit: This is not the same question as mentioned "How to leave body of question empty?". I'm asking why can't it be empty. Ramhound's comment on that question does not satisfy me at all. Not exery question needs more details. Examples what I should add as a description to mentioned above questions are welcome so I can feel what to add to my future simple questions.
The Tin Man's comment also doesn't satisfy me. In my opinion, SE is also for simple questions and they are not always simple.