What's the point with that quite lackluster story in Endwalker?

[Tsiron]

I'd like to point out that that scene is not the first time we see a character's memories not be 100% accurate (unlike Echo flashbacks for... some reason). It's admittedly optional content, but as part of the Bozja storyline you

go into Cid's memories which turn out to be a complete mess, you fight Bahamut and Varis and other such nonsense etc.

[Rosenstrauch]

I'd like to point out that that scene is not the first time we see a character's memories not be 100% accurate (unlike Echo flashbacks for... some reason). It's admittedly optional content, but as part of the Bozja storyline you

go into Cid's memories which turn out to be a complete mess, you fight Bahamut and Varis and other such nonsense etc.

The same storyline actually goes into why this is, in a roundabout fashion, by differentiating between "extrinsic" memories and "intrinsic" memories. The former being conscious/subconscious memories and thus being prone to errors, and the latter being an accumulation of the person's senses and thus being perfectly accurate. If we assume that Echo flashbacks tap into intrinsic memories, then it actually makes sense that they'd be more accurate to reality than otherwise.

But yeah, the Venat flashback we experience during our return to the future is so wildly inaccurate to what we learned in Shadowbringers that—whether it's "symbolic" or an abridged but literal version of events—it's questionable if any of it even happened in reality, or if it's just a self-serving memory from a person who can't or won't remember what actually happened. The biggest differences being that the flashback presents Venat as alone in her opposition to Zodiark's followers and Hydaelyn's creation and the Sundering being a spur of the moment decision, whereas Shadowbringers depicted her as having a bare minimum of twelve accomplices and their plan to create Hydaelyn and oppose Zodiark having been decided well in advance of her actual fight with him.