My father has dozens of notebooks in which he writes prose. I couldn't imagine doing the same. I want my writing to be searchable and digitalized. It's easier to edit text when it's not committed to ink.
Nevertheless, I still handwrite an awful lot, but it is annotated drawings, mathematics, the things that can't be done easily with a QWERTY keyboard.
I don't want to input LaTeX on a keyboard, I want to handwrite on an iPad and have AI transform that into LaTeX for me.
Technology therefore is killing handwriting in some contexts and enabling it in others.