Btw. I don't like your analogy, I did not conclude from your example that A/B Testing never works. But one example is enough to show that it does not always wor

Btw. I don't like your analogy, I did not conclude from your example that A/B Testing never works. But one example is enough to show that it does not always work. Specifically, the claim "use A/B Testing and your signup rate will improve x%" is apparently not true.