Luclin also didn't trivialize old world content, which is key I think. Planes of Power, on the other hand, made anything not Planes of Power largely irrelevant.
AA's, such as they were, really just allowed for minor progression of a character. They were no more game altering than equipment upgrades, which aren't available at a certain point. At least, in Luclin.
On the topic of custom content, I think as long as you keep the level capped at 60 and don't go about implementing a ton of game-breaking droppable items, you're in good shape for keeping things classic, or at least keeping classic-era dungeons/raids relevant. I don't think AA's break anything.
But this is all well after Velious, IMO.
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Kruall - Troll Shaman
Ferok - Dwarf Warrior
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