This pops up over and over.

But it is like "debunking" astrology. If you think you did, you didn't understand astrology: the "signs" are just to randomize so not everybody gets the same advice on the same day. Its purpose is to keep people out of ruts, for which it works.

This is similar to hunter-gatherers relying on omens to direct where to hunt: it keeps them from exhausting any single place.