Fully agree with you there. We got to view Amaurot how Emet saw it or how he wanted to remember them. It will probably not be 100% accurate. The devs still decided to show us that not all was well either. They showed new people being unsure if its good to be there. They showed with a side quest that not only a child already has to hide their individuality but that they do fear that it would lead to bad places. Also this very same quest hinted that Ancient ones existed that did not possess the huge amount of aether to just create something, they gave us a crystal to do so.
On top of that we know from the short stories that seemingly souls existed that were so angry that they bascially had to be forced back to the livestream by Hades. Why would such a thing exist if all was great? And as you said, why would the role of Azem be needed?
I just doubt that no conflict ever happened, maybe not in Amaurot itself? Or maybe Azem just always stopped it themselves thus the view that all is perfect was kept? After all they were able to feel all the emotions we do. Which includes the negative ones too.
(I also find it fascinating that in the german translations of the story about the volcano, the people living on that island were called mortals. Just a wrongly written word or did it maybe hint that Ancients were not all on the same level?)
Also we do know that new life started with Zodiark. Where those suddenly lesser beings without that power? Could that be the origion of our races or did they exist before?
Well in the bad future we bascially died on the battlefield thanks to black rose, which means that Emet and Elidibus are still alive. In that case Fandaniel would still be under control. At the same time the world was still in a really bad form 200 years after that event since the Black rose did not just kill people but was also very bad for the land itself. So if nothing was done, a huge amount of people would have died, future generations would live a terrible life, the ascians would still be there thus the rejoining and rise of Zodiark could still happen (or maybe the source is so badly messed up that its quite lost and even though they are there, the Ascians still cant fullfill their dreams).
We do not know how bad the destruction will be. Of course people will sadly die and some countries might get hit very bad but since its an MMO and 6.x was already confirmed we know that we will win over this.