Why do "Open World" games have to exist on roughly square maps? I spend most of my time near roads, just like in real life.
Take that 100 square miles of content, and give me 200 miles of a road, with a quarter mile of content on either side.
I guess this is how "Euro Truck Simulator" works, but I want to be able to get out of the truck and have an adventure.
The book "The Earth Abides", features our hero going on an adventure down the abandoned, Rt 66.
THAT would make a great video game.
Octodon is a nice general purpose instance.