Why not make event armor and weapons scale with your level?

[Gilraen]

I don't think I've seen a single game where gear scaled with your character... Not even in single-player titles. I mean, there was scaling in some like Skyrim, but it only scaled for as long as you didn't obtain said item. Once you got said item it stopped scaling and was forever at whatever level you got it at. Item scaling as you suggested flies in the face of an equipment system like you see in... well, every game ever. It's an interesting idea, but remember that this is an event, full of puns and in-jokes (seriously, they are all level 13. Eh? Eh?! *wink*).

In FF11 there was the Rajas/Sattva/Tamas Rings

[Ring] All Races
STR +2~5 DEX +2~5
"Store TP" +5
"Subtle Blow" +5
Lv. 30 All Jobs

Level
18 - 29 Bonus: +1 (lvl 18-29 bonus possible via lvl sync)
30 - 44 Bonus: +2
45 - 59 Bonus: +3
60 - 74 Bonus: +4
75 - 99 Bonus: +5

I'd like to see long lived gear like this in FFXIV (obtained by completing story missions etc)

Wow, I stand corrected. There was also the Trump Crown, now that I think about it. But, mind you, these are items akin to Skyrim's where you get them as a reward for particularly difficult content, not event items you get just for attending.