I think there are several reasons why Amazon doesn't include SD card slots.
To begin with, it's not a part of Amazon's model for the device. It's designed to work in conjunction with Amazon's cloud, so there's no need, from Amazon's perspective, for expandable storage. It doesn't help you buy books from Amazon or read the books you bought from Amazon, so putting one in a Kindle doesn't make sense from a design perspective.
Second, it saves costs. Adding a card reader would either lead to increased prices or a reduced margin, and that doesn't make sense for something that's designed not to need one anyway.
Plus, leaving one out helps them make the devices thinner, which is a big plus in today's market where everything is advertised as being thinner than its predecessor.
The only reason I can see that Amazon would have for adding an SD card slot would be if its absence was hurting sales, but given its dominant position in the market there's no evidence that that's the case.
As far as Amazon's concerned, there's just no point.
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