There are so many things that could be improved in Pagos, in addition to what's already been said:

Increase the number of treasure chests
Yes, Anemos had too many. But now Pagos has too few. If I'm getting so few chests now, I want there to be something REALLY good in them -- not cherry confetti. I'm sure you can find a nice middle-ground regarding chest drop rate. Especially since it's now much faster to open them.

Put valuable items in the chests
I was excited to do Anemos because I came out with a truckload of chests and perhaps one of those would be a T-rex! I'm sad that Pagos doesn't at least get a snowy Mylodon mount -- complete with a snowball throwing action!

There's no reason to explore
I want to explore this frozen wasteland and find unique treasures. I don't even mind there being some element of danger where I have to sneak. But I know that if I go into an area much higher level than I am, I'm going to die and get that huge XP penalty, so there's no way I want to go wandering off! I am an adventurer! Let me adventure!

The bunnies are a gimmicky joke
Here's a thing that leads you to rare treasure -- at the edge of a death cliff riddled with monsters! Oh and not everyone gets the treasure in a FATE that so few people do because it doesn't give XP. Come on, SE -- more carrot, less stick!