what kind of ereader we need?

Many people think that the ereader is far from good enough. They think that a black and white screen is too bad. But o don’t think so. The main function of ereader is to read books. If the reader has too many function, I think it will attract our attention,and we are no longer be able to reader books again, for many people. So I think a ereader with a black and white eink screen is enough. I don’t need too many function when I read a books. I just want to keep my heart peaceful.