I appreciate your post Fasces. I am not going to be able to match your length, but I will respond briefly:
First, definitely, diplomacy is much more complicated than chess. That is clear. I didn't understand what you were saying you doubted of what I said. I even agree with you that chess is not an apples to apples comparison; in general, I hate two player games because there is no diplomatic element which is my favorite aspect of all games, not just diplomacy. This is really the complaint you lodged against chess as well. The point I was making, though, and I stand by it, is this: In well-designed games, the more one know about strategy and tactics, the more rich the strategy and tactics get, not vice versa.
As far as variants, I agree that a semi-decent strategist could come up with a good strategy on any variant. I, personally, have had a lot of success on variants. In the most recent world game I was playing, I was leading the board as India before I had to pass the game off for personal reasons. The only chaos game I have ever played I got a three way draw. Even further, I think good diplomacy strategy applies to almost all games. For example, I can't remember the last time I lost a game of Settlers of Catan. But that isn't the point. The point is what I said above- The more people know, the more interesting the game. That's why I like classic.