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According to SOE thanks to Storybricks the AI will make NPC's smarter in turn making the trinity not effective. Shouldn't this same logic be applied to players? It's smart to have a tank who has more HP take direct damage. If the game is truely free then players should have various tools at their disposal to manipulate trinity gameplay because it's the smart choice.
Let's take the tank out of the equation you are still left with a healer. In fights players take damage which means a healer should always be a good choice. Even if you heal a player and the NPC attacks you then your option is to heal yourself until the NPC get's the attention of someone else, which it should do since it's a smart NPC.
Let's skip to control. Stuns are always good since a NPC doing nothing and taking damage is effective. If there are more NPC's then taking some out of play seems to be a smart choice... the logical choice.
If the skills are available then the trinity might not be REQUIRED but it should still prove to be more effective. This is pure speculation as so far we have not seen this great new AI. The main point here is just because NPC's are smart and act on logic does not mean that players need to be considered stupid and not follow the same rules.