I need a dictionary in my reader because I need to learn English better.
It can be very helpful if I can just select one word and get a definition of it in the bottom of the page as Kindle can do. Unfortunately, Kindle is not available anywhere else except US.
Maybe some people (not as "smart" as the ones who don't need a dictionary) are discouraged to buy a book just because it has too many rare words. For example, a farmer might not know English as good as a lawyer but maybe he likes to read too. But if the lawyer wants to feel very smart compared to a farmer he should say "We don't need dictionary, we are enough smart people."
Why should an ebook reader manufacturer limit their target to only those customers who can speak English language very well?
Sony and others, give a chance to all the people that
wants to read! They will buy more books.