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Coming from the software development world I know for a FACT that SOE is not employing people from MIT's AI department for their game. This would be the only way to produce AI even close to challenging enough to make the "Trinity" system obsolete. However, even MIT hasn't created AI advanced enough to make this claim.
Additionally, we had "difficult" AI back in 2004 during EQ2's closed beta. We started testing AI that would dynamically choose, on the fly, whom to attack based on class & actions they were taking. Mobs would randomly scream out "Kill the healer! It is keeping the weaklings alive!" (an undead skeleton within the instanced orc dungeon in Commonlands outside Freeport). I don't know what happened to it as mobs stopped doing that kind of stuff shortly before launch. Nothing was said about it, and launch went on without a further word on it.
The thing is, it made the game actually difficult and fun to play even with trinity. Tanks had to constantly watch their aggro or risk a healer or nuker being fried. It most certianly did NOT make Trinity obsolete.
ps: wtf with this whole "Trinity" name? CC (ie: control from enchanters, etc) has always been a critical role in Everquest. So why only pick Tank/Healer/DPS and call it Trinity???
Anyways, we've had basic-advanced AI since 2004, but no one has been using it. In the instances it was attempted it never made the game impossible, but from what I've been told by developers in the industry it made it that much harder to make new content for the game as they always had to consider how the AI would be used in that situation. This is the only reason I can guess as to why they stopped using it????
Either way, don't believe this nonsense about EQ:N. They're following the current "trend" of PR buzz phrases to catch people's eyes. They should just come out and say that they want to move away from selective roles like Tank/Healer/Dps/Control. After all, we all know dungeons in Everquest 1 cannot be done without that specific setup right guys? (In before I post about constantly doing DPS only dungeon runs etc in EQ1, or before someone else does)
Seriously, it really is getting frustrating reading about this "Advanced AI" when it doesn't exist. It's like the CEO of Spandex coming out to tell everyone we have conquered the effects of "Gravity" to a room that has at LEAST one Physicist/Engineer that knows for a fact we haven't yet.