Francisco De Jesùs.
The answer is simple Amazon primary business are books, e-books and the consumer needs at least a confortable view for reading their e-books.
Amazon also have to allow actual kindle customers to launch these already purchased e-books to the Amazon phatablet with a screen 5.5 to 6 inch. with no charge at all.
Apple did that when launched the first iPad all the apps and e-books already purchased on the customer iPhone were all of them launched on the iPad with no extra charge.
Amazon has recently been demonstrating versions of the handset to developers in San Francisco and Seattle. It intends to announce the device in June and ship to stores around the end of September, the newspaper cited the unidentified sources as saying.