Um, I pointed out the convention involving stressed syllables a little while ago. While you quite correctly expanded the reasons, it's not quite correct to say nobody explained it.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'