100%, in fact it's like when you write a "cheatsheet" only to realize that now that you did dedicate some time to - write down what is important - present it

100%, in fact it's like when you write a "cheatsheet" only to realize that now that you did dedicate some time to - write down what is important - present it in a condensed manner - verify that it does indeed cover only the topic you need ... then ironically enough you probably do not need it anymore.