So what I'm seeing besides the fact that this is obviously an existing relic of the Ancients. Is the fact that we're repeating our building methods making you wonder who is "reborn" with the same kind of construction sense.
Basically in the story Elidibus kind of force awakened Echo in the Crystarium. So I went back and looked at the MSQ dungeon. It's pretty much similar structures though for a different purpose are re-used assets of the Crytarium. Which is fascinating. Like I said it's easier way in terms of development to finish dungeons. That and society tends to build the same way due to environment, and culture. But if it's not a coincidence that's a fun Easter egg tbh
https://i.imgur.com/INVuKVf.png
The stairs to the last boss is the same kind of pathway that leads to the Hortorium and The Trivium
That said it's not a match for match, they just have enough to remind you of the Crystarium.
Obviously this is done to house concepts...and in these screenshots there's a LOT of concepts and crystals.