How could YoRHa/Nier sci-fi Tech fit in Hydaelyn's lore? The Allagan and the non-allagan alternatives.

First we gotta answer:
When did the fragmentation of the source happend?

I have no idea, but if it was before "life" existed in Hydaelyn as a planet, which is kinda a dark soulish idea of hydaelyn being all "perfectly balanced" in the aetherial sea where "nothing could possibly change" due to all being in it's perfect "rest position" so to speak. (A no, no aether/quatum tunneling).
If this is the case, then maybe there are versions of Hydaelyn where the Allagans never even or developed in the way we know they did in our Hydaelyn. Maybe they were replaced by other nations, groups... Maybe the developed for another 4 thousand years and never faced calamity or non strong enough to topple them.

We also know in our version of Hydaelyn or the universe we are in, there are other planets with other life forms (dragons and a bunch smart enough to create a near perfect self sufficient cybernetic AI super weapon... That for some reason DIDN'T DESTROYED US, like, evaporate us from existence... ANYWAY) i think we are starting to have problems with what Hydaelyn actually is. The Planet, The Crystal (metaverse?), The Shard (parallel realities?) and the universe itself. Like. We know of the Void and the shard of the derplander, and for one we have absolutely no reason to assume they followed our own developings, while the other seems pretty pretty prettyyyy close to our, these reflections are not perfect...

With this, i think YoRHa can either:

-A replacement of Allags in another Reflection: Pretty bad and lazy if you ask me.
-Allagans of another reflection that didn't fell to calamities but are now in the brink of being tipped towards darkness.
-Non allagan super civ ruins of a world that succumbed or is about to, to either dark or light. Maybe we will explore a Hydaelyn way in the past or the future, at a more realistic Cosmological Evolutionary scale.
-Non allagan super civ ruins, this time arround, is not from a reflection but in ours, the core.

Honestly at this point im not sure if we are traveling in time or dimensions. Like are we visiting other reflections (Aka: we are going to save minfilia in the shard of the derplander) or we are traveling in time? Or both? Honestly this is a hella mess... Hopefully it will be properly explained...

Maybe YoRHa is in the planet Omega was created. Using Omega as a mid point transition between the levels of high tech from Nier and the base blueprint that upstarted the Allagans.