>>724065078
Well the main story has been written ages ago.
Though they do retcon things here and there as they change their mind about it.
For instance, if you did Inazuma today it would be setting up that boss in the holiday resort. Liyue established that Guizhong used to play with Khaenrian machines because they're absurdly advanced tech, but by Fontaine they both made advanced machinery a common and normal part of the world (through Deshret) and had changed the advent of abyssally powered ones we fight to be a recent development from the time of Irmin (and Guizhong died 1500 years before him).
Likewise, they dropped the idea of filling the place with way too many ancient civs, but if you go to the entrance to Khaenria, you can still see that the OG plan was to have them use a new architecture set. And they likewise made sure to only show stuff made of steel for any interiors to leave room for giving civilian Khaenria a look different from the other old civs.