This was exactly how I felt. It felt like such a betrayal, honestly. I love Vrtra, he was so hot and cool and amazing for doing what he did, but riding on the coattails of the actually good storytelling legacy that FFXIV has accumulated for years for such an obvious goosebumps-farming moment? Genuinely, piss off... I honestly felt the same way about the last MSQ dungeon too. It's as if the writers took what made Amaurot and Dead Ends so special, made a copy of it, spent hours to make it so the likelihood of you feeling any sort of way towards the people in the dungeon vision was gone, and then thought it was a slamdunk of a dungeon. Like, no. The reason why Amaurot and Dead Ends are so, so incredibly special (to me at least) is because there was proper build up to CARE what was going on in those dungeons.
Amaurot would not have felt like anything if we hadn't spent most of the MSQ listening to Emet-Selch and learning about the Ancients, their civilization and their tragedy from a man who we knew we could never avoid conflict with. It was a partnership doomed from the start, but that's a big part of why the journey felt so meaningful. He saw his old friend in us, and in him we saw a glimpse of what we used to be. We cannot get those times back, we do not want to get those times back, but we as a traveler have almost an obligation to hear about this tragedy that shaped the world. Instead, Sphene is automatically our friend the moment we meet her, and the big twist with her isn't even a twist because she's been shady in cutscenes from the get-go. Plus there wasn't enough time to properly care about her.
Dead Ends would not have felt like anything if we hadn't gone through... well, everything. It wasn't even just about the Meteia and their despair, it wasn't just about the Ancients who we spent the majority of ShB and a big chunk of EW learning about, it was about the entire world. It was about everyone we know and have known, ever. It was about even creatures we never got to know, who experienced tragedy and died. Dead Ends is just, so much. Instead with Alexandria, we spend what feels like 6 hours of MSQ yo-yoing between "oh well we should learn about these people and be compassionate" vs "actually no they don't matter because they aren't real". It feels so... empty. I do not care for these characters. I've been told several times to care, but whenever the game attempts to make me care, I remember it just a second ago making it so that I simply cannot care. Making an entire final flashback dungeon based on a society I have such a complete void of any emotion for just because it worked so well two previous times, without even understanding what made them work so well in the first place? I can't believe someone actually decided this was a good idea.