Single biome worlds wont work

Well... single biomes come... in a peculiar format. Deserts feel more like islands surrounded by oceans... Any kind of ocean is basically a plains biome with some really deep "river" water (also some really weird shipwrecks onto the grass?), and lush caves isnt even a cave at all, you can see the skies and i swear its so cursed to look at the flora just growing without any roof above it and in broad daylight. 

Anyone else going through this?