I find his dismissal of iPad writing to be unconvincing. He talks about how we have calibrated our writing utensils over centuries to involve the proper amount of friction, and how that knowledge goes out the window when you're writing on an iPad. That may be true, but it's not like you can't just re-acclimate to the experience of writing on an iPad. Most people don't handwrite much, period, so if they start handwrit…
While you may be convinced writing on a screen or tablet is objectively superior to doing things the "old way" there is literature on the topic indicating otherwise you might want to consider - that being said, everyone is different in their preferences and anatomy. I for one can't stand to write on a plastic/glass surface with a stylus, the ergonomics feel wrong and my retention for journaling is significantly worse.