I'm not saying it. I'm saying what the developers seem to be aiming for. They've been using the weapon questlines to reinvigorate older content ever since they introduced the Zodiac Weapon saga in 2.1, and so far they've shown no signs of changing that philosophy, and until they say otherwise, it is safe to assume that they will continue to do so.
And truth be told, keeping people interested in older content is good for the game: it's one of the only ways the game can continue to support newer players, who missed out on everything in ARR when it was current, and newer players are absolutely and utterly necessary for the game to survive. I may not always agree with how they execute that goal (or with the content they choose to emphasize with a particular quest step), but the overarching goal is rather important for the long-term health of the game.
Outside of keeping people interested in older content, it is also within the team's best interest to use older content where they can because of resources. They can't magically make their team bigger, unfortunately, so dipping into the old stuff allows them to keep the game going in a way they probably couldn't otherwise.
