Yeah, this is why I ask about specifics. Doing exhaustive methodological observation and statistical analysis for something that's pretty darned obviously the case through basic life experience is a waste of time for most humans. That makes it firmly suboptimal (aka, not the best) unless you specifically want exhaustive methodological observation and statistical analysis.
My reply is to Salix who in previous conversations has denied the independent existence of any one or any thing beyond his own mind. Because of this, when Salix answered "I would test it", that does not include any others. It is only his mind testing, and only his mind observing the results of the test. I think it's important to point this out when interpreting Salix's answers. It would be wrong to understand it from the point of view of anyone other than Salix. That point of view has significant limitations which need to be applied.
What you're suggesting as "pretty darn obvious" would include more than 1 independent individual in agreement on the phenomena, right?
Also: the questions asked for the best way to "know". Pretty darn obvious is an "educated-guess".
Educated Guess =/= knowing
Statistical-analysis =/= knowing
Because the confidence of knowing from statistical analysis is much greater than the confidence from an educated-guess, statistical-analysis is better.