jalapeno_dude
AKA Panda Judo Eel
Why haven't we? That's a question for a sociologist. Inertia, primarily.My point is that if those games are sufficiently comparable to NESing and they have found a way to incorporate both complex rules and fancy stats into a rich storytelling environment, why haven't we adopted their "best practices" into NESing?
I do, a fact from which you are free to draw your own conclusions.I don't know anything about forum based RPGs so I cannot speak to it.

Here are some "best practices":
-Separate IC and OOC threads. If every previous post in the thread is a well-written (or at least grammatically correct), in-character diplomatic communication or a story, the next post in the thread is more likely to share these characteristics. Short OOC questions should either be posted in the OOC thread or placed in spoilers and accompanied by something IC in the main body of the post.
-Applications for player-controlled entities. In a fantasy or fresh-start NES, this would entail submitting a worked-out culture, nation, government, etc. Taking the time to compose something in a fair amount of detail makes it more likely that the player will be invested in the game and not quit. In a historical or alternate history game, this would entail submitting a nation choice, what the player sees as that nation's motivations and agenda, and why and how they want to play that nation. This allows the mod to ensure the player knows what they're talking about, or to suggest another nation that might better fit their expressed play style. Again, a player who has taken the time to do this, and knows that the nation is one they would enjoy playing, is more likely to be involved and in-character.
Notice that these two suggestions are essentially concerned with book-keeping and procedure. I would suggest that the NESing community as it exists now has the potential to successfully combine complex rules with story-driven or in-character gameplay. It just requires players to be sufficiently interested and invested in the game, which in turn makes the mod less likely to kill a game out of frustration or boredom.