I’m leaning into the system agnostic/neutral approach with fiction setting and game world, Aorlis. Dice have become involved in the campaign side of the equation, because not everyone is equally qualified to decide everything by fiat. Random encounter charts, for example, were important to set up.
For example, I need a weather system. I begin to look into a simple approach to weather, and I wandered into a wide field of variables (season, climate, geographic location, etc.) that I had to stop. I still am unsure how I’m going to proceed.
Is it important for a medieval fantasy world to have ocean current maps, wind current maps, and/or plate tectonic maps? At some level, maybe. When it comes to plate tectonics, I realize I’ve once again stumbled into a field about which I know little, trying to reverse engineer something that probably doesn’t subscribe to any known logic or science. It’s interesting, because as a storyteller you can simply state what a thing is, and it’s so. As a campaign resource, the underlying logic means a lot to some people.
More as the project develops.