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Why is it not appropriate to test the weak anthropic principle as a physics theory?

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Anthropic principle The Hubble Deep Field. This image, the result of 10 days' observation by the Hubble Space Telescope, shows 1,500 galaxies in different stages of their evolution.

It is not appropriate to test the weak anthropic principle (WAP) as a physics theory because it is not a theory of physics at all; rather, it is a methodological principle.1

The WAP is defined as the truism that the universe must be found to possess those properties necessary for the existence of observers. Because it functions as a methodological tool for interpreting observational evidence—ensuring that researchers account for the conditions required for life when evaluating cosmological models—it does not fall under the criterion of falsifiability, which is the standard used to evaluate whether a theory is genuinely scientific.12

If the WAP is ignored, scientists may draw incorrect conclusions from observational data by failing to compare the observed universe with one that is statistically probable given the requirement that it must permit the existence of life.1