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The actual touch input is quite low resolution. A fine tip will make little or no difference. Apple didn't invent the capacitive finger interface, it was a 20 year old tech. Older phones and PDAs used resistive to allow annotation, selection of tiny items and handwriting, depending on models. Modern high resolution input tends to add Wacom tablet mode or resistive (much cheaper) to the capacitive layer. The IR touch on older ereaders is slightly lower resolution than capacitive is technically able to do. It is about 30 years old.
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