my only argument is stating that the boundaries of whats acceptable are much more forgiving than once thought.
We all know that people can grow outside of the safe zone and not get root rot. We all also know that if thousands of people did that you would start to see a trend. Environmental suggested zones are only saying this is an environment that should be healthy and beneficial, that's all.
Not to mention as pointed out earlier you have no idea what you're D.O. was and without tests like that it's a bit meaningless.