lumiose city has very few landmarks and the camera is completely unusable. it also uses tank controls. Lumiose was slapped into the game so game freak could jerk off their new 3D environments but it didn’t get the polish it needed.
And for all your complaints about ORAS removing content you leave out how Mauville City added content that wasn’t even there in Emerald, like the Inverse Battle house, the food court, two entirely new floors, and all the little shops around the main ring.
Again, the only thing old Mauville has is nostalgia. And again, that’s just what you’d expect from Hoenn.