Earlier quoted context omitted.
> This advice was never based on science. No, it was based on common sense. If X causes problems, not doing X is generally a good idea. It turns out that in this particular scenario, common sense was wrong. But allergies weren't understood by science, so all we had to go on was common sense.
What’s “common sense” is drastically different depending on whether you assume a complex system is static or adaptive.
"I don't know how this bad thing works, better rub it on my gums" is not a good strategy in general.