It doesn't have to be. I don't think there are sufficient empirical studies to suggest writing by hand is better in some dimensions than typing.
I prefer it myself for several reasons. First, it forces me to filter the present jumble of ideas in my head into a linear progression on the page. Second, it helps me resist the temptation to edit myself before I have finished. I tend to be more mindful and focused when writing long-form.
Writing digitally, which I often do, comes with the temptation to edit and succumb to distraction before I've finished a thought. It allows me to explore many branches quickly... but quantity is often not what I'm after.
I think what you consider sufficient has more to do with your personal process and what you hope to achieve with your writing, if that makes sense.
I'm not sure what you deem as "sufficient", but there certainly are studies suggesting that handwriting has some benefit over typing w.r.t. learning and memory [1].
I prefer it myself for several reasons. First, it forces me to filter the present jumble of ideas in my head into a linear progression on the page. Second, it helps me resist the temptation to edit myself before I have finished. I tend to be more mindful and focused when writing long-form.
Writing digitally, which I often do, comes with the temptation to edit and succumb to distraction before I've finished a thought. It allows me to explore many branches quickly... but quantity is often not what I'm after.
I think what you consider sufficient has more to do with your personal process and what you hope to achieve with your writing, if that makes sense.