Titans have a long history of unused engines. But I guess they're going to do as UndedoKoleda said.The bigger, bigger question, is why didn't the Titans use Zereth Ordos to "order" the entire reality at once, similar to how the Janitor tried to. After all, they had the knowledge of it and more than likely had unlimited access to their Zereth and the means to power it up?
The even bigger, bigger question, is why didn't Sargeras "unmake" the entire existence that way? After destroying the Pantheon, he likely had access to both Zereths- of Order and Chaos, plus he had a spare titan(Argus) to fuel the process?
Something tells me that we're in for a lot more retc... I mean "new information". If I had to bet, the next in line is that Azeroth is not a nascent Titan, but a First One.
Just when the shitshow called Shadowlands started to fade from my memory and I was looking forward to an "untainted" new journey in Dragonflight, Steve "many threads of a rope" Danuser had to continue his "fuck the old lore" crusade.