As an Emacs user who spends most of my day in this editor, I've always felt a disconnect when it comes to blogging. I have to leave my comfortable editing environment, log into WordPress through a browser, deal with the web interface, and hope I don't lose my work if the browser crashes or my connection drops.
More importantly, I'm an occasional blogger who often gets ideas while working, but I feel uncomfortable opening my blog's admin panel during work hours. It's too visible, too distracting, and frankly looks unprofessional even if I'm on a break.