I thought SNS originated amongst Australian homebrewers...?
In any event, the problem with your assertion is not with science. It's that homebrewing in garages, basements, and patios is not the same thing as highly controlled research in a laboratory. This is behind the saying, "reality often astonishes theory."
The conditions under which repeatable results are observed/obtained over and over again are not representative of the highly variable conditions under which homebrewers actually brew. In the real world, there are a multitude of unknown, uncontrolled variables that singularly and/or collectively can influence the final beer. In the real world, two different homebrewers making the exact same beer using the same ingredients will make two different beers.
My broader point is what while peer-reviewed research is useful, don't ignore your own empirical observations, even if they don't square with the peer-reviewed research, and even if someone on a homebrew forum insists that your empirical observations must be wrong.
Popularizing SNS on a homebrew forum does not constitute "peer-review." The plural of anecdotes is not data. You must know that.