Probably because they all go straight to the cash shop right after. It's almost worse actually - with WoW they add more to the pool and then cycle old with new. But with XIV, if you want the old again you NEED to pay money.
https://store.finalfantasyxiv.com/ff...us/product/882
https://store.finalfantasyxiv.com/ff...us/product/794
https://store.finalfantasyxiv.com/ff...us/product/793
https://store.finalfantasyxiv.com/ff...us/product/663
https://store.finalfantasyxiv.com/ff...us/product/458
https://store.finalfantasyxiv.com/ff...us/product/586
https://store.finalfantasyxiv.com/ff...us/product/585
https://store.finalfantasyxiv.com/ff...gb/product/218
https://store.finalfantasyxiv.com/ff...gb/product/101
https://store.finalfantasyxiv.com/ff...us/product/459
https://store.finalfantasyxiv.com/ff...us/product/460
https://store.finalfantasyxiv.com/ff...us/product/457
https://store.finalfantasyxiv.com/ff...us/product/456
https://store.finalfantasyxiv.com/ff...us/product/363
https://store.finalfantasyxiv.com/ff...us/product/362
https://store.finalfantasyxiv.com/ff...gb/product/366
https://store.finalfantasyxiv.com/ff...us/product/226
https://store.finalfantasyxiv.com/ff...gb/product/365
https://store.finalfantasyxiv.com/ff...us/product/225
https://store.finalfantasyxiv.com/ff...gb/product/102
...
There's a lot more obviously.
Anyway - I think they're both kinda meh in their own way. Only difference is I think WoW does way more casual events through the year, making the world feel a little more lived in. :/