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Those recommendations in the A&M site are guidelines, not hard and fast laws of nature. If you follow the guidelines exactly, you still do not have a guarantee of a perfect hatch. If you violate some, you are not guaranteed a total complete failure. The guidelines are there to improve your odds of success but they do not guarantee anything. They are just good targets to shoot for.
Refrigerated eggs are a great example. Not all refrigerators are the same temperature. Some areas in the refrigerator are warmer than others. In the warmest spots in some refrigerators, the temperature is probably not that much lower than the lower bounds of the guidelines. In the middle of the summer here, storing eggs in the coolest part of my house, I am probably further away from the guidelines than A.T. Hagan is with his refrigerator. If you store them in the colder parts of a refrigerator that is set pretty cold, your hatch rate will probably not conssitently be as good as those stored in a warmer spot, but that does not mean they are guaranteed to be bad.
Some people go out of their way to violate the guidelines and still have success. Those eggs can be pretty tough. But just because you sometimes have success after violating the guidelines does not prove the guidelines are rubbish. They are not. The guidelines merely improve your odds. Sometimes you roll sevens and sometimes you roll snake-eyes, regardless of the odds.