On this...

Originally Posted by
EdwinLi
The problem with your theory....
is that you're assuming that no matter what a Calamity MUST happen for all Shards to fuse into one Planet. However, I am saying that it maybe possible that later in the story we find a way to fuse all shards into one world without a Calamity thus creating this new world where the lands of the remain shards become part of this world without overlapping one another's existance.
Of course the different shards will bring with them the countless different cultures and conflict will appear but that is part of the cost just like discovering a new Continent that has its own Civilization with their own belief and cultures.
This is very much a possibility. The Ascians devised a reliable method of rejoining the worlds, that works for them given that they don't really consider the lives on these worlds to be true lives, and also because they see it as necessary to undo what Hydaelyn had wrought. Their plan is to both unmake and then remake the world as they consider it necessary to be.
However, that does not mean their method is the only one by which such a rejoining could be effected. Especially if much of Eorzea is just water, you could see new landmasses being placed in such areas.
And...

Originally Posted by
dragonflie
About Hydaelyn
Imo, I don't think Hydaelyn has evil intentions despite being possibly a primal. We know from the Gobu storyline that the primals will take on the emotions of their summoner. If the summoner has pure intention, then it's possible for a primal to be born with just good intentions. Ramuh is one example, he was self conscious that he would be threatening the very land he was summoned into to protect.
True - conversely, it also means Zodiark does not need to have been evil simply due to being aligned to darkness (it's not innately evil) and could, in principle, be re-summoned so as not to be. I think the big issue the Ascians have with Hydaelyn is that she disrupted their plans to bring back all those who were lost in order to summon Zodiark and restore their world, as she would have taken half the aether up. That would not have sat well with them, especially if her summoning was performed against their wishes. Obviously, the Rejoinings as they wish to undertake them are not compatible with our characters' desires, thus they remain firmly opposed to one another.
And...

Originally Posted by
Alleo
A NPC says that it felt like the planet was giving up on living. So at least for me it feels like the Ascians were not completely without fault for this. Of course we need to learn more to truly understand it.
The thing is, it sounded as though it crept up on them and forced their hand into desperate measures. Especially given that the ancients possessed great fonts of innate aetheric reserves, I think it is quite unlikely that what was happening to the planet was due to them drawing on it in any way, unlike the case of Mhach and Amdapor, where the war was messing up the aether in their environments. If they bore any fault, it is probably due to ignorance more so than malice, but the description we were given is suggestive of some manner of parasite. I agree we need a bit more to draw any firm conclusions as it's too vague, as things stand. These could have just been extra-planetary parasites, after all, or maybe even ones that had lain dormant until beings with sufficient power drew their attention. It could also have been ancients who did not regulate their powers with the same self-control as the Amaurotines did. Hard to say given how many possible things this could be.