I think I saw a thread somewhere else with a person pointing out something like "It was a good story, but an unecessary one", and that comment stuck with me, because it's quite spot on.

It added nothing to the world building in the end, because... Even the Archons swore to keep the events in secrecy, and effectively nothing will change, so other than the WoL's personal story journey, what that was for? Unless of course, this is some kind of prep for some future narrative thread, much like the Ivalice Raids set up something for the Bozja's storyline (albeit in a small scale).