Taking the braziers off the plaza dais
Removed the braziers I'd put on the four corner pillars of the plaza dais from the generator, leaving just the brick pillars and flagstone caps.
In 142 I put braziers on the brick pillars at the four corners of the dais, but looking at it again, it was better without them, so I took them out.
What I built
I removed the four corner braziers from the generator entirely, along with their flame, smoke and spark particles and the fire sound. The brick pillars and flagstone caps stay as they were. I rebuilt only the plaza, then rebaked and saved the pathfinding data (NavMesh).
Now there are 0 braziers in the plaza, and 87 plaza props including the dais parts. Even after rebuilding the plaza, the opening tour waypoint heights stayed the same, so the double-raised waypoint problem from 142 didn't come back. The path from the south up onto the dais still connects fine.