The most effective use of taking notes is to actively engage with the content by figuring out how to organize it and what to include and what to leave out. Even though the author says to just capture everything, if you are doing it by hand, you are making decisions on what to write and what to skip simply because you can't write as fast as someone talks. One of the reasons taking notes on a computer isn't as good for retaining information is because you CAN probably keep up with how fast a professor talks and capture everything--so you don't end up actively thinking about what is being said.