Fynn mostly addressed what needed to be said about the double standard and "sexy vs sex object" debate. As for Tolkein, it should also be pointed out that LotR is an amalgamation of folklore and mythology from all over Europe, so much of his terminology was somewhat understood by its contemporaries and in today's age, said information has been milked dry by every fantasy author who came after Tolkein. He did write a new language for the elves and other higher races, but I would point out that said Elven language is not a huge plot point, I mean the Istair is their term for Gandalf and his kind, but it's not like that's what he's called for the whole story, he begins with the lay men term of Wizard all the way back in the Hobbit. So the new language deal is more flavor text and world building in this case than relevant information that will be brought up with no context for a hundred pages in the book. Secondly, he does a decent job of translating said language to the reader rather quickly, usually within the story itself. So again, the terminology issue here is a moot point cause Tolkein would explain relevant stuff to you quickly, not to mention his Elvish language follows a cohesive understanding.

The issue with XIII's terms is not that their incomprehensible (that just makes them stupid) but rather the unknown nature of what they mean is lost on the player, especially since it takes the game what feels like forever to fill in the blanks and most of the time it's in the glossary, which forces you to stop playing the game so you catch up on all of the important lingo to make sense of the plot. Whereas FFVII and VIII stuck mostly to terminology that made bloody sense even without exact context. Hell the real issue with both games is why would anyone name badass super soldiers/mercenaries SOLDIER and SeeD in the first place since one is redundant and the other sounds way too "flowery" to be an elite military force, even if it is trying to be cool with the capitalized D. Yet, you can still see the parallel and symbolism without Cloud or Quistis trying to sit you down and explain it to you, and even better, neither game waited to really talk about it until hours into the game, nor force you to stop playing the game to read the glossary in case the first explanation didn't pan out.

As for Xenogears, there are a few differences with its use of terminology over the previous titles we've talked about. Firstly, as Fynn pointed out, all of the terminology is rooted in Greek Gnosticim or Jewish lore, so the only people screwed in this regard would be any country that didn't have to deal with European or U.S. powers meddling in their affairs at some point in the last 3000 years. Secondly, much like Evangleion, a lot of the name dropping is is more flavor text than relevant. The names of Gears, Towns, major locations, and doomsday buzzwords by the Gazel Ministry are either irrelevant, symbolic but not important to the plot, or the context of the term being used is enough to get the gist of it. The rest of the terminology follows the VII and VIII route where it easily makes sense with a just a little context given in the scene the term is used in. Thirdly, the terminology dropping and cryptic dialogue are intentional to confuse the player, Xenogears is a mystery concerning its world and the character of Fei; and the roundabout plot choir that is most of the villains are meant to confuse and confound you enough to keep you playing; Xenosaga did the same thing.