So I sorta randomly generated a world to play in Minecraft. I ended up with Mushroom Island biome only, normal difficulty, doubly amplified landscape, increased sea levels and lava lakes with a starter chest, but with ore veins set way, way up.
If there hadn't been a sapling in that starter chest, this world would have been almost impossible to survive in. Even now, it's impossible to go to the End due to a lack of materials - I can't even craft glass and I have to ration the few scant wooden planks I have.