With so much note taking apps nowadays, I can't understand why does anyone still write notes with pen and paper. You need to bring the notepad, book or that paper to retrieve that information, and most of the time you don't have it in hand. While my phone almost always reachable and you carry when you go out. For those still like to do handwriting, there's many app does that and they can even convert it to text notes.
So, if you still write notes with pen and paper, why?
People tend to retain more of their written notes than typed. The act of writing forces you to assimilate and summarize new information on the fly. Typing allows you to take more complete notes closer to a verbatim transcript, but you engage less with what you’ve typed.
Its your sense of proprioception, too. To write something with pen and paper you have to move your hand in three dimensional space, and this does a TON to engrain the information in your head