[kettlecorn]

Another example of this: Bing’s slogan for a while was, “The best search engine for the most popular searches”.

They had ran studies and determined that they were the same as or better than Google for a large percentage of the most popular queries. Therefor they must be better, right?

Well, when you apply the principle you described it’s clear that everyone would have different obscure searches unique to them. When people learned that Google worked better universally they’d go there instead, because with Bing it wasn’t good at some of the more specific searches and it just wasn’t worth using it if it didn’t work for all cases.