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So here is the thing, an e-reader is not a good general computer. Button placement is different (designed around holding it to flip pages), the screen is radically different (the whole point of the device) where refreshes take about half a second. If it were designed as a general purpose device, that would mean the UI couldn't be catered to giving a good reading/navigation experience, button placement couldn't be geared around it either, and the screen would make it crappy anyways even if it were. This isn't about getting locked into anything, a full android os on an e-reader is pretty retarded if you actually want to use it for reading books.
I do understand the drive to pull things apart and see how they work, but I was responding to a comment that a full android install should be on these things.