To be honest the whole Elpis journey cocks up the plot royally, and further proves why you do not mess with time travel in your writing. We're told that it'll be impossible to interact with the timeline. That's a great start. Time travel is more like rewinding a video, and isn't going to fall into any plot holes...and then 5 minutes in we throw out all the rules. They offer no explanation as to why the WoL refuses to discuss who they are, which we end up doing anyway.
Did I somehow miss it, or was Kairos never mentioned until it literally showed up out of no where? That could not be more convenient that a memory wiping machine just happened to be sitting around. Meteion flies away but I thought the whole reason we couldn't do that was because we were technically indoors. Where is she flying off to? They don't explain what a spatial confluence is. I guess it's breaking the wall to get outside of Ktisis Hyperboreia. What is the point of the diversion if Emet can break it open by snapping his fingers? Why did Emet and Hythlodaeus stand around waving at us while we escaped? There is no reason Argos could not have swooped in and carried them out with us. Hermes made absolutely 0 attempt to prevent us and Venat from escaping, they all just sat around and let their memories get wiped.
Hermes and even Meteions motives are either very weak or poorly explained. We're supposed to believe that the two people who value all life more than anything, would in a matter of minutes decide "Let's not even bother trying to learn from the mistakes of other people and kill everyone right now instead." Thank God Emet's there to say that's complete bullshit.
Venat is supposed to be the opposite of Hermes. We're supposed to believe that she has faith and hope. Yet Venat came to the same conclusion as Hermes, that we are doomed unless we struggle and despair. She doesn't try to avert the final days in any way, and takes it upon herself to decide who should live and who should die. Then there's the post cutscene which comes out of nowhere attempting to retcon the sundering again. We're shown that Venat, before Zodirak, before becoming Hydaelyn, during the middle of the final days was when she sundered the world. That's not possible so...what was that cutscene all about? They're trying to convince us that we had to be sundered in order to save us, but there is never a compelling argument for why that's true. We're told it was to utilize dynamis, but we never learn or use it. We accidentally use it when Thancred is unmade, but that's such a specific one use for dynamis that we have no control over, that Hydaelyn could've never predicted we would need. Hydaelyn actively chose to withhold vital information to the survival of the star. Maybe she truly thought it was impossible for us to defeat Meteion. Then the whole sundering in order to better fight against her makes no sense, and she would have never even considered allowing us to fight even if we did beat her.