Forums, external tools, newsletters involve the exchange of information among players, ie people. External tools (and some have argued that they should have been banned also, but FD was slow to provide suitable in-game tools) at least provide for a sense of human judgment, a balance of opinion to choose this or that and to apply that judgment to the game. Automatic scripted bots cannot do that. By their very definition and action, they are automatic and do not contribute to the game except to achieve a person or group's objective.
It's the same argument in real life. Should automatons be allowed to take over our jobs? A very similar set of arguments can be introduced for and against. But in the end, the benefit to the human being, or the player in a game, has to be paramount.