These final days are canon.
As much as it all seems chaotic, I'm pretty sure that these final days are canon. The Imperials would legitimately be invading at this point, Dalamud is projecting visions of Nael Van Darnus and the creatures are frenzied because Dalamud is effecting them.
All of these are things that have been witnessed before, just on a grander scale now.
Whilst some people believe that these last few days are 'just a bit of fun' or 'silly', I wouldn't be so fast to write them off as a non important part of the lore for the future.
We were given relics that we obviously wouldn't be able to keep, at the same time that our prayers are now effecting people visually. The relics are a temporary gift from the twelve, as they've obviously decided to actually aid our endeavors.
So... Just because the final save has occurred, that doesn't mean that what's happening isn't important. Keep it in mind.