Creativity and complexity in dungeons is fun, and important...but there's a time and a place. Those sorts of designs are only fun once, maybe twice, before they become frustrating and tiresome on repeat.
FFXIV's dungeons aren't D&D dungeons, they're content that everyone is expected to be able to perform and better players can perform quickly and be rewarded for.
Complexity and creativity belong in non-roulette content, like extreme trials, savage raids, side content like Eureka/Bozja, etc.