That's how Star Citizen is doing their planets; different procedural biomes that an artist can take and brush around to quickly build a whole world with details

That's how Star Citizen is doing their planets; different procedural biomes that an artist can take and brush around to quickly build a whole world with details that you can walk around, but they can also zoom in and move rocks, make lakes, place structures, and whatever else. It's a much bigger scale than an artist could design by hand, but we're not at a point where an algorithm can fill a universe with memorable landmarks.