I personally really enjoyed the TBC prepatch, although it was very short. Some of the vanilla dungeon loot is pretty… underwhelming. I think in prepatch it got a bit of a facelift, although that was when some terms got changed (crit rating, hit rating, etc.). I recall having quite a bit of fun playing a new toon and seeing the dungeon boss greens become blues. Maybe it would make more sense if dungeons also became more challenging.
It would also be interesting if healing gear also had a bit of spell damage on it like it does in TBC classic.
This would change the game a lot (classic+ territory) and probably wouldn’t happen but it’s fun to think about!