I have to admit, I don't have much positive to say about an attempt to commentate on emotions and struggles that are relevant to us and were pretty obviously directed to us by the writers as existing humans paying for this game - hope, despair, and the struggle to live - based completely on impossible strawmen and scenarios mostly meant to give tons of assurance to the existing status quo, but that's probably a personal thing that there's no use in debating. I'm also probably a bit ornery about "if your theme has no application or utility to living people it's worthless," lol. But if someone gets something positive from the story for themselves, that's great and I'm happy for them. It did the opposite for me, but it is what it is.
This is one of those things where I think it sounds 'good' when painted with a broad, thematic, vibe-based brush, but immediately falls apart when you look at what has been written with closer scrutiny or thinking of the Ancients as actual people rather than thematic pieces. It's difficult, for me, to apply that general "you can't be afraid of different views and diversity!" scold onto a culture we see built a large part of their society on debate, and has various NPCs passionately insisting on the virtues of 'diversity' - heck, even using that specific word. Citing a societal dress code as a sign of dangerous, suppressive conformity seems, uh, weird at best to me and somewhat insensitive at worst, and also something that falls apart when you examine the nuances of what was portrayed closely, given that we also see that not everyone within Amaurot agrees on the urgency of the dress code and that children, at least, are often encouraged to break it to explore their own creativity.
But sure, perhaps that's what they - or at least some of the writers who fall on the side of "the Ancients had fundamental cultural failings" - were going for. It's just completely undermined by the concrete reality of what was written, and necessitates asking you to ignore that.