Random biome based features/structures selection

Minecraft is awesome but exploring is not to necessary. after 1 or 2 times exploring you don't really need to again. So what if there where many structures that the game could decide to use whenever generating a biome so you can have a savanna with little to no trees and some rocks and pebbles but in another one there are bigger higher mountains and many trees. Making many possibilities possible maybe even add more blocks that sometimes generate but sometimes don't like mud. This could even be used in caves oceans and cliffs. Maybe even do this to ores that like in some biomes there is a TON of coal but little to no redstone meaning that if you chose to settle you're base in a biome you can have the luck of having a literal gold mine while the guy in the neighboring biomes of the same types can have a coal mine. This should not work / minimalistic for diamonds. I think this system would be fun to completely change how the world looks without to big of a performance issue