Who the heck still uses biospheres?
i did because its fun having the entire biome encased in a sphere and having to battle a billion mobs to get to either the next biome or the nearest ore sphere(both of which usually end in my inevitable demise via hug, arrow, or void). plus it keeps everything together and neat. ever tried them?
who the heck used them in the first place
someone who wanted to have access to all possible biomes without having to search the entire globe for 12 hours for them. i personally had never seen a mushroom biom without this. this one was genned inside castle walls which are 6-8 blocks thick of cobble through the use of a world generator. the same world genner had a golden tunnels (or something like that cant remember the name) option which meant that you spawn in genned tunnels deep beneath the ground where more mobs than you could ever handle or count will inevitably spawn and gangbang you as soon as you play the world. i barely managed to survive for 5 mins. there was glowstone scattered around to assist you but it was futile. now i'm rambling.