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

[YukikoKurosawa]

You know what I just realized? There is zero mystery after Elpis. The entire mystery of the plot is revealed in that zone. Halfway through the story we already have our big final reveal, so there is absolutely no mystery to carry the rest of the story. So not only is it an arguably underwhelming reveal, it happens halfway through the plot leaving us with absolute nothing to carry the remainder of the story. It's just "alright well I guess we just go and kill Meteion now". But first lemme go show these rabbits around on a tour for an hour because that's important. Riveting, truly.

Imagine if, for example, there was another big bad and it somehow hijacked Meteion from outerspace after the Meteia encountered it, that was actually behind all the extinction of all those worlds, who still wasn't revealed even in Elpis. So then we're left to wonder "what did Meteion really see? Who or what did she encounter that's now manipulating her? What's it's motive?". Even more, say Meteion leaves at the end of the dungeon to go join her new mysterious master, what happened to her? What happened to her sisters? Are they still alive? Can you just imagine. Something to you know carry the remaining 30 hours of plot. Something wasn't taking fucking bunnies on a tour.