A thread about vets and their opinions on temp drops was made not too long ago. The general consensus was vets are not always a reliable source to base your husbandry on. Here is said thread if you'd like to give it a read.
https://ball-pythons.net/forums/show...he-recommended
It's always good to compare your sources and double check if what you're doing by is really fine, or if you've just been lucky so far and problems have not emerged YET. Especially if multiple people are telling you something is off.
You're probably long gone by now but what's the harm in checking instead of digging your heels down and crossing your arms saying you're fine and how dare we question you? Stop making this about you.
As a side note, any breeder can claim to be a professional. Frankly I trust breeders here on this forum with years of experience who share their knowledge, provide explanations and are willing to discuss why their methods and husbandry practices work and having healthy, thriving snakes to prove it.
I certainly trust that more than a simple "because it's like nature" statement.
Food for thought friend.