If you can provide a stable heat environment by heating the ambient room temperature the snakes are kept in or you live in an environment where temperatures are adequate for the majority of the year then there is no reason to need an under tank heating source. I provide one because I am able to, I want to, my snake uses it, and it gets cold in my house and I do not have a isolated and dedicated snake room to provide adequate heating.
I have an enclosure big enough and staged well enough that my snake feels safe and comfortable and regulates depending on his need at the time. I have another snake that never goes to the ground to rest or digest so belly heat is pointless. I have a third snake that is nearly subterranean and as such "belly heat" is an absolute must.
Do what you think is right for your snake, not something a commercial breeder tells you to do.
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