All animals live considerably shorter lives in the wild....living in the wild is the direct cause of that. I don't see any reason why feeding every other week would be bad for a ball python. There is no factual backing that says a bi-weekly feeding schedule is detrimental to the life span of a ball python.
I think we rely far too heavily on recommendations and guidelines set forth by care sheets and forums rather than knowing what animals actual need to survive successfully in captivity, and learning from our own experience with our animals. The guidelines for keeping ball pythons fall within the same general range, but every snake is different.
As humans, it is also our nature to want to see our pets eat. We feel better when they feed more regularly. Feeding on a weekly schedule is absolutely fine, but I don't feel it's absolutely necessary.