Well I don't see how your first impressions can be divorced from your general understanding of the series as a whole, and what trailers do and don't tend to convey in that series.

Like if you'd given me that exact same trailer but just changed the name of the game from Final Fantasy to something completely different, my reaction to it will be different, even though the content of the video is identical, because my imagination is going to start going in different directions in terms of the sort of game it will end up being.

I certainly agree that it's probably the most generic fantasy setting they've done for quite a while. But I just don't put much weight on the aesthetic of the setting really, because I think the quality of Final Fantasy games is almost completely independent of that.