The only use I make of my ereaders. phone and xoom are to check formatting of my completed books. I also sometimes proofread them there but I typically write down the problems on a small notebook I carry in my back pocket (see my poem -
The Poet of Utah Park

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https://www.mobileread.com/forums/sho...postcount=1231).
I suppose proofreading might be where I could use annotation (which I never use).
I jot down ideas, thoughts, sentences, poems, fragments in my small notebook and transfer or write them in my spiral notebook/journal. Often a piece of writing will start in my journal which I will then transfer/type in to my desktop which is where I do all the writing. Like GMW I work from home exclusively but should there be need to travel I have a laptop for that reason.