Then why is anecdotal evidence (i.e. look out your window) one of the foundations of FET?
It's a foundation of reality.
Anecdotal evidence is one of the weakest forms of evidence there is.
It's not anecdotal.
Along with "the burden of proof is
only on RE'ers", it something that marks FET as a pseudo-scientific. If I was paranoid I'd say the window test was deliberately invented by someone who should know better to prey of people who don't know any better.