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You are right that tablets provide more versatility and colour comparing to e-ink readers.
However, Onyx Boox M92 can do the same annotations as Celtia has shoved for tablet, but only in 16 grades of grey. It is the truth that the work with annotation is inrudimentary state now, but it may be much better in several months, year...
At present time, tablets provide better workflow for work with documents like text books, scientific texts, etc. E-readers provide less eyestrain and much longer 'battery life'. Using e-reader is sort of compromise between usability and eyestrain, now. I belive e-readers will catch up tablets soon.
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