Yeah I’d like to see this too, years into Classic release. I wanted Azshara Crater to be in the game so bad.
Karazhan obviously was a Vanilla raid, I remember going through it for the first time and wondering why the entry level raid was so detailed and impressive in TBC, turns out it’s because it was intended to be a later raid in Vanilla.
At that point, I think the team was still full of the passionate and talented people who put Blizzard Entertainment on the map, so I have to wonder if their decision to leave things out or put them in a new expansion was the better choice.
It doesn’t feel like it, but I wasn’t there, so I don’t know. Either way, I would have loved to see those things that were planned but never happened for Vanilla.