10 years ago you would have been told something else and 20 years ago would have been even different. The hobby gets into a rut with the acceptable ranges of care for ideal living situations until a few people come up with a new twist on care and slowly it starts to take hold. That's where we are today with the current humidity baselines.
That being said, these guides are not just arbitrarily setups that people pulled out of thin air. These are determined from years of improvements in understanding and care that have shown to provide a working guideline for the easiest means to provide a healthy environment.
That's why if you keep a non moist substrate in a 70% humid tub enclosure it is not going to be detrimental to your snake but for the wide range of care people give and to give people starting in this hobby a goal to hit, these ranges have been set.
Another way to think about it is that those ranges are the ones that thousands of man hours of trial and error have shown to keep a ball python healthy and happy.
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