It's not so much that they're catering for the median user as they are trying to make the cheapest device they can get away with and still have people buy it. They make money selling the content so they cut the device costs down as much as possible. The fact that even casual readers tend to buy more ebooks than paper books (which was partly novelty but by now is mostly the ease with which it's done) means that you can afford to piss off the heavy readers a little.
This may change as the market shifts again and people scale back their buying more in line with their actual reading. At which point ereaders may become a profitable niche and we might start to see some of these features added again. But whilst Amazon are selling Kindles as cheaply as they are that's unlikely to happen I feel.
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