The Reasoning behind The Sundering? (*6.0 Endwalker Spoilers*)

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Nothing there says they knew it was Meteion or the actual source of the Sound. Unless the Japanese version says "Meteion is at the end of the universe, Singing our despair into existence", your quotes don't support your position at all. In fact they directly contradict you, since they aren't saying "this is the fault of outside sources, specifically Hermes escaped creation called Meteion", they're saying "Zodiark isn't enough to stop our doom", but they don't mention anything about it being because of Meteion's song.

If anything it seems Venat just told the Convocation "hey guys Zodiark isn't enough to stop our doom" "why not?" "because he's just not. Trust me bro, I'm Venat." "I mean can you give us an actual reason?" "No, I don't need to. You just need to listen to me."

Yeah we don't do much better, I doubt that had much bearing on Venat's decision to not tell the Convocation about Meteion though.

Our unstable folk don't threaten all life in the Universe either, we can afford to be a little unstable.

Well, I guess Zenos is like 10% Seymour Guado (with the obsessive stalking and coming back from death to continue stalking us). So we're going to need to find our own Sephiroth and Kuja at some point.

And then there was Xande who wanted to either destroy the world and/or take out the entire universe with him because of his nihilism but luckily the WoL doesn't need to deal with him except when farming tomestones.

Or rather what I'm saying is that this is a Final Fantasy game I 100% expect we're going to get another big bad who threatens existence again in a future expansion lol