A while ago I was trying to plan a trip to Death Valley and I was exploring backcountry camping as a possibility. Backcountry camping is possible in Death Valley, but looking at this chart I can see that no one really does it, and it might be best to reconsider my plans.
This is valuable information for individuals planning an overnight stay at any park.
(Of course, it's possible that the data is missing, but I think my point is still valid)