within the constraints the universe presented.
Edit: I don't really think we disagree. What I believe is that there are very important concerns with the setting's aesthetic. Which a lot of people here and there are formulating in terms of genre, which is fraught with failure because FFXIV is insanely eclectic. Moreover, unlike what you believe the game has only grown more dissonant over time, not less. Sharlayan is an advanced 'crystal civilization' with the aesthetics and governance of a modern Oxbridge country. Garlemald is a 'high dieselpunk' civilization with WW1-2 aesthetics, but it also has gundam robots in it. And their technology has only more and more complex since ARR, not less.
Seriously, there are no constraints in FFXIV as
a genre. The game features gene-editting, space exploration, and programming languages inside of literal computers. If Allag feels like 'high magic' as opposed to sci-fi to you, that was just cope. On both our parts. But Allag hasn't been just the Crystal Tower for a very long time. There's a major distinction between a magic solar power plant, and the stuff we learn in Azys Lla, the Summoner quests, and so on.
Think about Alexander and Omega for a moment. Alexander can be construed as a highly advanced golem brought about by magic. Sure, if I rememnber shit right Alexander wasn't just conjured he was actually designed by people who exist in the world today. But Omega is a far cry from even that. It's a space robot. A conscious and intelligent being that explicitly doesn't have a soul. It's a computer and every advanced technology in the world is downstream from Omega.
Mind you I don't really like the sci-fi stuff most of the time either. And I agree that the setting is as its best when grounded on a fantasy aesthetic. But that's the key point. It hasn't been for a very, very long time. The implication is never that Allag's magic is industrialized and very advanced, which is the case with Sharlayan. Rather that Allagan technology and science is something mostly incomprehensible to us 'Crystal Age' mouthbreathers. At that point, I don't really see much of a difference between what Allag and Solution 9 do to the setting. Except in the realm of aesthetics.
You hit the nail on the head when you said that Solution 9 only looks like cyberpunk lifted into the setting. It's not a genre problem. It's not a fitting into the setting problem. It's an aesthetic problem. You go to Azys Lla and you are greeted with electronic guitars and keyboards. Everything is hyper advanced. The technology and the actual knowledge involved is Star Trek tier. But the aesthetic of the place feels
outlandish. It's like our planet took advanced tech from space and digested it into a fantasy culture. Solution 9 is Seoul with more laser signs.
Lastly, one bigger issue that nobody seems to bring up is that Solution 9 might be an actual existing hyper civilization. So far we've only interacted with the ruins of Allag. The fact that Solution 9 exists bring up some questions that might end up being answered in the laziest way possible. Ie, they are another group of xenophobic isolationists. And that's assuming they aren't invaders from outer space, which would be an echo from FFIX.