They should spin off the old Edge as a reincarnation of Reader from Windows 8.
It was a great app and I hoped it would become as versatile as Preview on Mac.
It was annoying when I double clicked a EPUB (or PDF) it would open the browser and sometimes all my tabs from last session would open and in most cases just the EPUB would open and I lose the previous browsing session.
This needs to be a dedicated app separate from the browser. I hope they have something in the works.