I think that Venat's statement that end "so I take nothing for granted as I walk my path" and the uncertainty that we were in a closed loop timeline or not until the Mothercrystal scene meant that Venat was trying to find solutions to the Final Days that wouldn't involve Zodiark or the Sundering, and by the nature of returning to our timeline we don't see if there are timelines where Venat was less cautious about not taking any steps that would butterfly away Zodiark's creation nor do we get to see the timeline where her pleading to the Zodiark worshiping survivors of the Final Days that focusing on trying to recreate their post-trauma memory of their past by offering up their present and future while not addressing what led to what had destroyed it and how to defeat its source which was still out there worked without having to Sunder. The game posits that the Endsinger wouldn't be defeated by the Ancients as they were without changing - until she pulls out the sword Venat is trying to debate that change of attitude without the change of the physical world. We also don't get to see the timeline where we arrive long before Hermes sent the Meteia into space and convince him via a life-changing road trip that there are answers to the doubts that plague him and other ways to find purpose and meaning in life than the only one he's been told - or no clear answers at all and that's okay.