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It often seems like they threw every reason and the kitchen sink into why Venat sundered the world without notice or care of the elements that were contradictory. People are quick to point out that she made an effort to reason with her people in the post-Elpis cutscene, but if she was always going to sunder the world to make the Ancients able to interact with dynamis that means her outreach efforts were insincere. Otherwise, we have to accept that she believed the Ancients could have overcome Meteion without being sundered and thus it was not necessary.
As for Hermes, there's nothing to support him having brought dynamis to the table of the Convocation, so even if he were the only expert (which is also not supported) it wouldn't matter if that expertise wasn't a factor in the Final Days. The Watcher makes no mention of dynamis (and he should know), but he does the celestial currents. Elidibus later credits Fandaniel only with discovering the stagnation in said currents, noting that what we know at that point (before traveling to Elpis) is consistent with what the Convocation knew. He's not even remotely implied to be the architect of Zodiark so I don't know where people are getting that from, it's much more likely that was Lahabrea being the most specialized in complex creation magicks. What we do learn of Zodiark's construction is he was purposely aspected towards dark to encourage activity in those stagnant areas, nothing about dynamis.
I suspect people insist on reading more in the lore at certain points than there is, is because if he was not strictly necessary, as that entire Watcher sequence very strongly suggests, her plan also no longer becomes the only available option. My own take is that it wasn't and that she simply committed to that path because of the vagaries of time travel to which she bound herself; at least, in the sense that they're keen on narrowing her available actions in that way to avoid an outcome such as creating an AU where things ended differently while also not making her come across as totally unreasonable... but IMO that comes at the expense of having to invoke time travel yet again in a very muddled way and constricting her agency.