On one hand (heh) there's apparently evidence to suggest that handwriting activates parts of the brain which aren't typically activated by just typing something out. I can see how that would be the case and why it could sometimes be useful.
On the other, the idea of carrying a little notebook around to jot things down when I have a phone in my pocket, or using a fountain pen for longform text (trust me it would actually help you avoid hand cramps, aside from being less wasteful) all comes across as... intentionally inefficient? I struggle to see intentional inefficiency as anything but pretension. Like it's all just fetishizing living a more analogue life.
It actually makes the techbro in me think there's something to companies like Supernote and Boox and ReMarkable making e-ink tables that exist mainly so that what you do choose to write by hand can be digitized, stored and made searchable.
I suppose that's actually exactly why people tend to journal in physical notebooks? Because what you put down in there will just disappear unless you crack open that notebook again.
...Meanwhile I'm pretty sure a lot of people feel that writing things by hand gets their creative juices flowing. That's sort of interesting to me, because personally, by the time I'm finished writing a single sentence whatever I was thinking about is halfway gone. If I don't get it down real quick my thoughts will drift to something else entirely, so when I had to handwrite essays in primary school I'd get completely stuck in a way I never do just typing things.
TL;DR someone who's bad at empathy talks about handwriting as if everyone else experiences the world exactly the same way, please knock him off of his stupid pedestal
I hate writing by hand, even though I went all the way through high school doing it (only things like final essays were typed, and even then you had to do it at home). It always hurt to do it the way I was supposed to, my handwriting never improved after like 1st grade (until I taught myself to write left-handed in my early 20's; that's much neater), and I have a horrible sensory issue involving the feel of a dull pencil dragging across paper. It makes me want to jump out a goddamned window.
Even so, writing things by hand helps me remember stuff better. Once I got to college and I was allowed to use whatever writing implement I wanted to take notes with (sparkly gel pens in a variety of colors), it wasn't so awful, and it helped my memory so much that I don't think I ever had to look at the notes I took ever again. So if I'm going to a lecture or a conference or something, I'll still bring a notebook and some fancy gel pens.
Otherwise, the only thing I do with hand-writing is quick notes when I'm talking on the phone and need to record an account number or e-mail or whatever, or when I need to create a reminder to go back and fix something I'm already ahead of at work. Post-it notes are so much quicker than taking the phone away from my ear, navigating to OneNote, selecting the notebook, selecting "new page", and then typing it out. If I want to transcribe the information in some way that's not strictly left-aligned, or if I want to draw circles/boxes/arrows, well, One Note says "too bad, suck it up". Plus, I can stick the post-it to my monitor and it's in my line of sight all day; shit I note down in the phone is out-of-sight, out-of-mind.
Yes, I know I can use the desktop version of OneNote, which has more functionality. I do use it when I'm outlining or making adventure notes for the D&D game I run; it's fabulous for that. But it's utter shit for quickly jotting down "call Denise at [number] <--- IMPORTANT DO BEFORE ----> call Electric Company about acct [#] at [number]". That example doesn't even make sense typed out.