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

[CrownySuccubus]

Okay i’m sorry, Yshtola doubts her a couple times. Meanwhile the other scions? All blindly following hydaelyn.

When? Most of the other Scions don't care about Hydaelyn one way or another. The twins are mostly focused on the human element (learning the Forum's plans, saving the Garleans, saving the Hannish, and then using the Ark ). Urianger decides to help the Loporritz with their plans for a while G'raha mostly speculates and conjectures, and comes up with the Elidibus plan. Thancred only cares about Ryne, and Estinien just wants things to stab.

Who, besides Krile, was "following Hydaelyn"? Hell, as I said, it was even repeated several times that they couldn't even figure out what she wanted.

Compare that to how the ascians and Zodiark are treated and yeah…. It really isn’t reaching too far.

Again, Zodiark was already screwed by the time we could have any meaningful interaction with him. Hell, he's not even treated as a villain in the end.

It’s painfully obvious that they retconned the whole suspicious of Hydaelyn thing. I mean if you want a better example, when we have the choice to bring up hydaelyn’s lies to the watcher, he simply says yeah she lied, and then that’s completely handwaved and he goes off on another tangent.

They didn't "retcon" it. They tried to negate it. You can literally start the expansion telling Hydaelyn you don't trust her, and the Scions (esp. Y'shtola) repeatedly bring up how suspicious they are of her plans. It isn't until the WOL goes to Elpis and becomes besties with Venat that the Scions stop suspecting her. And yes, THAT is definitely a valid fault of the story. As I said, I would have loved to have told Venat to drop her entire plan and tell the Convocation the truth.

Meanwhile how many storylines have we had now that revolved solely around “ascian bad and ebul!”

I mean, they were gleefully scheming to eliminate "lesser" races. Though they were victims before and during the Sundering, it's also a fact that they turned into cackling, genocidal madmen over the millennia. The Ancients are basically different people from the Ascians, including the Unsunderd. Even Elidibus, prior to ShB, was only marginally different. Emet-Selch is really the gold standard for Ascians, but he was an exception and not a rule.

As if the fact that Venat sundering Azem, her protege, wasn't bad enough, she spares Emet, then knowingly pits the two against each other in a fight to the death. Once again, why in TF would I trust the person not only responsible for ending my original incarnation by splitting my soul asunder, but knowingly guiding me to the point that I had to kill one of the people who was dearest to me (and vice versa)? Frankly, on a psychological level, it's worse than any other antagonist in the game has done.

As far as we know, Venat did none of that. We're never told how the Unsundered survived the sundering, but we're never told it was a deliberate choice by her.

Likewise, Emet-Selch is the one who wanted to kill you. In fact, Emet-Selch flat out says at one point that he doesn't care about the lives of even Sundered Ascians because if one of them dies, they can just hop to a reflection and look for a different one. Venat is to blame for the sundering in the first place, but don't make excuses for Emet-Selch and the other Ascians. They did what they thought was right, but they still had nothing but contempt for sundered lives.