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The problem with the PDA analogy is that PDAs didn't have any advantages over smart phones, thus when you could have both functions in one device, the PDA no longer made sense. It's fine to say that the advantages of e-ink aren't important to people like you, but you should remember that not everyone is like you.
LCD has a long way to go to match the readability of e-ink, and even farther to go to match the battery life if e-ink. If batteries were improved to increase the battery life of an LCD tablet, new e-ink readers would also have these improved batteries. So perhaps you could improve the battery life of LCD tablets to a couple days, but that same improvement would add weeks to the battery life of an e-ink reader.
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