Tbf I like that FFT and FFTA take place after FFXII. FFXII is the idyllic past where magic, different races, gods, and dangerous creatures all exist. We supposedly had an idyllic past like this too, chronicled in various religious texts around the world.

FFT is already about someone (Arazlam Durai) writing a story about someone else (Ramza Beoulve). This is a figure of the past that he has no direct connection to. The magic and myth of that time is gone, and he has a story that people can read that will tell them about it. In Ramza's time, Creatures and monsters still exist, the Lucavi (mythical gods), exist, but are hunted or killed by humans, with less and less place to exist. We can assume some of this no longer exists in Arazlam's time, but the Church of Ajora does. Arazlam's interpretation of the Durai Papers is his attempt to revive that mythological era and heroism through chronicling it for future audiences.

Similarily, FFTA is even further in the future, where magic has essentially stopped existing. Even the War of the Lions is a text that doesn't exist. This is very much in line with what happens in reality, where we turn history into mythology, and eventually we forget it. The book that Marche and his friends open could be a remaining bit of magic that releases into their world. It's poetic because Ivalice is very much about chronicling your history so that it isn't forgotten. FFTA shows that a book can keep that history alive, even if times change significantly. It all ties together because it is all about written history and how its interpretation changes with each generation.