How would you feel about Minecraft/Terraria style world generator?

For those who don't know, Minecraft and Terraria have custom options for world generation.

Some of these options include altering how mountainous or flat the world is, resource abundance, biome sizes, and some secret hidden seeds.

In Terraria, one of the secret seeds will generate a world where the game will start in hell, as opposed to starting on the surface, you need to dig up, not down, and the surface is incredibly dangerous.

This got me thinking about how these options could drastically change the Valheim experience.

Imagine a world where the swamps has hills and valleys,

Or a superflat mountain,

Or a supercontinent with many tiny biomes packed in together.

Or a backwards seed where you start in the Mistlands, with low threat Mistlands enemies, but meadows resources, with the objective to kill an overpowered Eikthyr who moves at triple speed, and non-stop spawning Neckers, Boars and Greylings.

Obviously the devs won't implement anything like this until the biomes are finished, but I would like to hear what other crazy world's you would like to play.