The study he cites is also specifically using digital pens
> Brain electrical activity was recorded in 36 university students as they were handwriting visually presented words using a digital pen and typewriting the words on a keyboard
kinda funny.
It's also not clear from this study that there is actually any benefit to "more brain activity". Of course doing more complex motor tasks requires more brain activity but nobody guarantees that this helps with remembering things.
i had no science, but in college for shorter works i always thought handwriting, typing, and reading it aloud was my allowing my brain to hit a problem in three different (not more, different) ways before / even if ever being in front of another human being (or now their non-union AI equivalent)
i still feel writing something down helps with memory formation, in part because i remember the act of writing it down. cocktail napkins and whiteboards way better than ipads also
i remain obsessed with Pilot v5 rolling ball extra fine; i would say Pilot g2s are for proles but the outcome if you leave it in the dryer is far less severe