Such devices could be set to do one thing. I think that this is a feature that will come. I already sometimes use my ipod as an alarm clock, but if I do, I need to remember to turn off notifications and pump up the volume. Otherwise I either get a notification in the middle of the night, which is unwelcome, or it doesn't make much noise and I sleep through.
But the devices are perfectly capable of, say, defining "modes", so you could have alarm clock mode, gaming mode, meeting mode, funeral mode etc. - and reading mode.
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