Mercurius
Legend
If there is a singular soul (and I am still not convinced there is one), figuring out what it is will, at best, be a task akin to genre definition. The edges are going to be vague, and a thing need not have all the tropes, or match all the style points listed to be included.
Basically talking about D&D is like talking about mystery novels. You tend to know it if you see it, but sometimes others will call it a thriller when you think of it as a mystery...
Exactly, well put. I am in 98.972% agreement

So, is BECMI Mystara not D&D, or is AD&D Greyhawk not D&D? I'd like to know which one, based on the criterion you have stated.
Wait for it...
Agreed.
Strange that, huh? We both agree with what Umbran said.
(pawsplay, keep going...)
If you want to be absolutely literal, sure. I think you won't gain much from the conversation doing that, but it is your right, so long as you aren't argumentative about it.
I think you'll get a whole lot more out of it if you look more at the spirit of the statement than the letter.
This. Thanks for this clarification.