I think pens and pencils are mostly just preference and habit. I have some draftmatic mechanical pencils, nothing special really, but I’ve been using them for decades.

I suspect the real advantage of handwritten notes (for those who benefit from them) is that writing them fulfills a learned ritual for putting the brain in learning-mode. So, might as well match the environment as closely as possible, and prioritize familiarity over some quality.

Anyway, I can write obnoxiously small with my draftmatics, so I don’t see how the process could be optimized by a fancier pencil or pen anyway.