In the interests of quickly wrapping up a few loose ends (the new lore stuff is much more interesting):
When you first arrive in Propylaion, both Emet and Hythlodaeus are incapable of understanding what you are saying, despite the fact that you are able to follow their entire conversation. From their perspective, you're 'literally too intangible to form words'. It's only after Emet spares a snifter of his bounteous aether to bring you to their size that they gain the ability to understand what you're telling them (Lv. 86, Hope Upon a Flower).
Rebuttal can't happen without refutation. You seem to be misreading my points, which results in the 'counterpoints' not offering any clash for me to engage with.
You can take it as given that the timelines did not diverge in a meaningful way. If they had, the past would have changed when we left Elpis to return to the present. Why this is the case is left open to interpretation. In particular, it is not explicitly stated whether this is a stable time loop, or one that simply converged back on the same sequence of events to keep the future unchanged. It's also unclear about whether this was by design (i.e. Venat attempting to preserve the timeline) or incidental. I'm more inclined to think the latter:
'Until a moment finally arrives, we cannot know for certain what will come to pass - regardless of our supposed foreknowledge. So you needn't worry for us.' (Venat, Lv.87, Travellers at the Crossroads)
I'm not offering a specific interpretation on what happened between our departure from Elpis and the time of the Sundering. I'm just pointing out that there are pre-existing facts from the adjacent story that place limitations on what could have happened in that time period. So when you say it's 'open to interpretation', it's more accurately 'open to interpretation, but within the bounds of the facts of the story'. There are some solutions that are not viable. There are likely more non-viable solutions than we can predict, because we can't test every possibility. Your strategy would likely be more conservative on a single playthrough than one in which you can reset or undo your decisions to test what works.
I'm not sure why you think that enlisting Hermes' aid to create additional entelechies is a viable solution to fighting Meteion. I think the problem with this should be self-evident.
When I say that additional constraints are at the discretion of the writing team, I'm gently reminding you that trying to prove that the writing team are wrong with their own story is a futile task, as anything they offer in response is fact.