Way too often that is used as an excuse for various forms of laziness; to not think about the things you can already know. And that lack of thinking repeats in an endless cycle when, after your trial and error, you don't use what you learned because "let's look forward not backward", "let's fail fast and often" and similar platitudes.
Catchy slogans and heartfelt desires are great but you gotta put the brains in it too.