I do handwritten notes for anything fast paced where I also have to respond in real time, because handwriting is a less mentally demanding task for me to explain or capture a concept than typing. I can star, I can draw, I can make up any word I want without squiggly lines, lists are instantaneous. I do design work, and noting a design change through typing is a nightmare when I can just squiggle the layout and put an arrow, cross out, annotate, whatever. I also find I remember handwritten notes better. The notes are a incoherent, illegible, squiggly mess, and I usually know exactly what they mean at a glance.
I actually have a reMarkable and love it. I don’t really use the notes to text or cloud functionality often, but the few times I have, it’s been really helpful. I like it better than a notebook because I don’t feel like I’m wasting paper, so I take notes a bit more freely as a result. It’s also helpful in situations where it’s impractical for me to use a keyboard. For example, I teach, and when I’m grading a presentation or explaining a concept to a student who already has their own laptop in front of them, I don’t want to muck with trying to make sure they can see my screen and it’s the proper size when it’s faster for me to sketch out the concept.
I’m also trying to learn Japanese, and having a way to freely practice writing as many times as I need to without having to print over and over again is really useful.
That said, I can’t think of a reason I would ever write anything with actual grammar or sentence structure involved longform. If it’s just me and the computer, no other interruptions and I can focus on my inner voice, typing is much faster and more natural. I’m able to type closer to the speed I can think than I can write, but that’s because I’m used to typing like I think - in full sentences. Trying to type shorthand is like sludge for me the same way trying to write longhand is like sludge. I use both because they serve different purposes for me :)