So it's a false premise. We don't have any evidence they weren't given a chance to try, in fact we were given the opposite. Venat is warning them in the abstraction you are shown. Just because she doesn't say "Meteion did it" doesn't mean she did nothing. So I guess your issue here is that she didn't warn them enough? I dont know what this is based on. I assume the abstraction was meant to give us an idea of what happened over days or weeks. Your opinion is that Venat waited until the very final second of a sacrifice to Zodiark to appeal to the summoners? That was for dramatic effect. I don't think that sounds plausible or consistent with any of her behavior prior to that. I think all of you are taking advantage of the way everything is shown to paint a certain picture. "Welp this five minutes is the whole final days so there it is, no choice". We know it was more than five minutes because more sacrifices were being planned after the summoning and that is part of what pushed Venat in the direction of the sundering. There was some kind of dialogue happening but we don't know the timetable exactly.
While we don't have confirmation on all the rules of time travel in XIV, for *this instance* we are clearly told we can't change the fate to come. And the reason Elidibus says what he says is to prevent the past tampering to break the future. What you are talking about works on a conceptual level for general arguments but it doesn't work for XIV and the story being told here bc they set a rule in place that wouldn't break the game.
Whats hilarious is that you don't know how definitions work, can't find a better word to describe what happened, and are seemingly triggered because you operate just as much as on theory as everyone else.