Partly it depends on the kind of writing/brainstorming I'm doing. I make lots of drawings in my notes, which is hard to do with a keyboard only app. Graphics tablets, even my Cintiq, which I use for actual drawing, don't have the responsiveness and clarity for note taking, diagram doodling, storyboarding, etc.
Plus, and this the real killer, the start up cost in time of using a tablet and graphic stylus are enormous compared to having paper and pencils handy on my desk. A cheap memo pad in my brief case is also handy. I've tried using my phone, but keyboard input on a phone, while I'm sitting somewhere away from office requires a minimum dedicated effort.
A lot of stuff gets lost when you have to overcome those startup costs. Even unlocking my phone with the thumb sensor contributes to me _not_ reaching for my phone when I've had a thought.
Plus, and this the real killer, the start up cost in time of using a tablet and graphic stylus are enormous compared to having paper and pencils handy on my desk. A cheap memo pad in my brief case is also handy. I've tried using my phone, but keyboard input on a phone, while I'm sitting somewhere away from office requires a minimum dedicated effort.
A lot of stuff gets lost when you have to overcome those startup costs. Even unlocking my phone with the thumb sensor contributes to me _not_ reaching for my phone when I've had a thought.