I don't think eInk display technologies are ready for such high update applications as drawing etc. It strikes me that many of these vendors are trying to "run before they can walk". How about getting good display of technical books and magazines sorted out before trying to tackle notetaking which is the province of tablets at the moment.
A good display for reading is not yet suitable for highly dynamic material - why have a clock for instance when it simply reduces your battery life? What's wrong with the time on your phone, or even your watch.
Get the basics right before adding bells and whistles. I admit this is a personal concern, but do the majority of eReader buyers really want to annotate material and look up items in a dictionary? What happened to just reading?
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