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

[Kazhar]

The fact this topic is still going is telling me Endwalker's story must have really been a let down for some people here.

This is the Game of Thrones season 8 of FFXIV. While Endwalker is not exactly the worst story ever told (... even though the moral disconnect is certainly something else), the fact that it ruins elements of a story people thought was genuinely good is what makes it especially awful. I don't think people would have cared as much if the game didn't have something before.
In a sense, the game is suffering from Shadowbringers' success in many ways.