I like this thread - it has been educational, in more ways than one, to read.
It seems to me that beetles are a low probability, but that hatching only occurs after a sustained time above a pretty much undefined number that may or may not be in the mid-to-high 70s with a possible correlation to the humidity. After 30 years of storing and smoking Cuban cigars, that's all I've managed to glean.
Presently, I allow my cigars to get to the mid-70s a during the summer, since I set my air conditioning at 74* and it gets a little hotter upstairs. So far, no problems and I do not freeze or take any post-buy precautions.
My experience is that I have not had beetles from mid-70s temps, but that's just me. Others may experience different results.
But then, that's what I've read here already, so my post is merely a "me too"