If you had the power to add one feature no questions asked, what would it be?

[Payadopa]

A rotating roulette each day or week for minimum item level savage, and same for extreme, with rewards similar to Faux Hollows and Wondrous Tails.

It's a wasted opportunity not to re-use content that the majority of players have probably never done because statistically it doesn't seem they were around until at least mid-Stormblood and that's reflected in an average conversation with the majority of people in the game. Plus it is fun to do a random old thing sometimes to test your memory.

I 100% agree. Also min ilvl dungeons.

Personally, I'd like to see Bozja-style FATEs in the overworld.