Originally Posted by
Hitei
It is fundamentally going to be a different game than Vanilla.
But that should have been obvious already:
Vanilla was not every person who wanted to PvP maxing Engineering. It was not UnGoro monopolies. It was not people prepping and organizing to snipe Scarab Lord titles months/years before the game launched. It was not people knowing where to level, or most of the populace knowing how to do quests. It was not video guides readily available, or widespread theorycrafting. It was not carefully weighing that theorycraft for racials to pick the race of your first character. It wasn't thinking about raid spec viability when you placed that first talent point, or knowing what quests were worth doing and what to skip, or exactly where your pre-raid BiS was going to come from before you even made your first toon. It wasn't warrior over-representation and hunter under-representation, or knowing the ins and outs of every profession, or exactly how farming worked at max level.
You are not ever going to get Vanilla. It is gone.
Furthermore, your "questions" in the OP aren't questions that need to be answered. As the second post in the thread pointed out, it's all or nothing.
Game-breaking, server crashing bugs were a major part of Vanilla. Removing them is a far bigger divergence from what Vanilla was, and what the Vanilla experience was, than something like achievements.