Thoughts written down can be retrieved as-is. This conquers hindsight bias which makes you change your mind after the fact, pretending you knew it all along.

Such research drew from Baruch Fischhoff's work in 1975 surrounding hindsight bias, a cognitive bias that knowing the outcome of a certain event makes it seem more predictable than may actually be true.[5] Research conducted by Fischhoff revealed that participants did not know that their outcome knowledge affected their responses, and, if they did know, they could still not ignore or defeat the effects of the bias.