I'm one who uses racks and I don't heat my snake room. It is my own personal opinion that we have been keeping ball pythons too warm.
I give mine a warm spot between 86 and 88 and the ambient temp in the room is about 74 degrees.
In seven years of keeping my critters this way, I've never (knock wood) had an RI in my collection.
To the original question, for me and mine, there are no cons to racks.
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