I strongly recommend writing and sketching and drawing ideas, ideation and design stuff, not necessarily long form writing.
There is an underappreciated synergy between hand, eye, and internal dialog. As you verbalize or whatever your idea, your hand draws; your eyes see what you write. There's multiple feedback loops.
I use 10 x 10 grid pads, Alvin mechanical pencils, Mars erasers.
Especially first or early draft stuff. Once roughed out, then I often move to machine.
Text, i type (tea, vim, libre office) but for ideas, paper. There's no distraction of mice, modes, files, typos etc.
Hand and pen to paper is magic and invisible, it's built in and long practiced.