Well. Ball pythons in the wild spend ~90% of their time holed up in a rodent burrow or termite mound. They rarely come out to explore other than to find food, breed, or locate to another hidey spot.
I can't imagine a burrow is very decorated.
I'm not saying to use a rack over naturalistic vivarium, but I don't think they mind the simplistic rack set up too much. Just do what you want and prefer. As long as your animals are healthy, eating, and thriving, its not a huge deal. If an enclosure is too stressful for them, they'll let you know.
Just my $.02.
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