This doesn’t flow naturally from the conversation, but I think the main reason people haven’t done a whole bunch of setting books for AW yet is because with the exception of needing roads (or at least plains) for choppers and drivers to cruise around on,* AW can be ported really easily to all kids of settings. I’ve seen fallen cities, nuclear wastelands, classic Mad Max deserts, and even dinosaur-infested savannas, all without a setting book telling me how much harm a dinosaur bite does.

*And both choppers and drivers are really easily re-skinned for Waterworld-style apocalypses, too.