So you only care because there's physical items tied to the event? Because there's a ton of allusions to other, non Final Fantasy games in FFXIV. Too many to count, in fact.

http://finalfantasy.wikia.com/wiki/F..._XIV/Allusions

Some of them do have actual items too. Why aren't you upset that the Valerian Gear is from Tactics Ogre? Or that the DRK AF set is inspired from Berserk? Just because there's no event to go with it?