I keep hearing this from time to time, and hey, if taking notes by hand helps you, go for it. More power to you.

But I'm not you. What works for you may not be a panacea. I work best with notes in a text editor, in markdown. I like to be able to move thoughts around, rearrange them, refine them. That also makes me remember them better. Handwritten notes are not conducive to that.