I remember that our local won an important arbitration because of notes that were more than

of conversations."
https://www.nytimes.com/2017/05/16/us/politics/james-comey-trump-flynn-russia-investigation.html

ex-senator from Fl. He was known for keeping a daily diary of what he did. He was accused of being briefed on water boarding, and not speaking out against it at the time. His notes said otherwise. He was never briefed.

So yes note and memos from the time in question are important.

contemporaneous notes,part of their years of Learning and training require note taking.

Always kept notes and contemporaneous notes in my business life. And as a Union Rep,it saved many a job for our members. Funny how a Arbitrator smiles when you pull out your note book with the facts and the Employers Lawyer tries to do a bullshit job with made up facts. Chances are,you are going to save someones job. Always used this principle,I will defend your rights,and I will not defend your wrongs.

Always kept notes even in B to B sales as well. Saved my bacon more than once.