Again... check my posts. No answer... just pointing to a question.
Now, as to interesting questions: Interesting questions get more interesting, not as people advance answers, but as they advance the question. That is, the question becomes polished and refined and becomes more enlightening and more interesting. We are, of course, tempted to say "That question is dead! Answered! (BJCP, Jamil, Palmer, your god here) said so! Look here!" That's not interesting, unless you're talking about a question like "is the world round or flat?" It's an almost religious approach ("The God in whom I trust has spoken.) The question as to the difference(s), if any, between a porter and a stout, is, I would hope you'd agree, not a simple question like that. Which is exactly why I offered no answer, just the question.