First and foremost because "best" is highly subjective and will not be interpreted the same way depending on whom discuss the idea. In practice, "the idea of the guy that has decision power" wins. Or, in a more democratic setup, "the idea that makes consensus" wins.
As an example, take the Seinfeld joke described in the article. It is assumed that the joke was included because it was inherently good and everyone agreed to use it. But if you listen to the podcast carefully, it was actually included because Larry David found it funny and vetted it. Had he not liked it, it would not have made the score.
Same goes in technology. "Best idea" from a technological or scientific standpoint rarely wins. Many factor ranging from financial to political weigh in the final decision and what gets implemented is often subpar when looked through the technologist lenses.