Niche market - they aren't marketed towards research. They are marketed towards those who use whispersync and read mangia.
The SD card thing has been a bit of a problem with the Fire. After our Fires were a couple of years old, I frequently have to do things to get the Fire to read the SD card. I bought a Nook Simple Touch with SD card about a month after it was released - still works perfect. So, keeping the price down may be why there is no slot. To make it work long term must cost more money for decent engineering. My theory anyway.
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