The benefit is mostly for the bloggers.
They get a UI which is custom-designed to focus on writing and little else. Dustin Curtis explains it here - http://dcurt.is/codename-svbtle
They get a UI which is custom-designed to focus on writing and little else. Dustin Curtis explains it here - http://dcurt.is/codename-svbtle
(the style of those blogs as a reader is OK, I've seen better and I've seen worse. If a blog has good content but is hard to read there are plenty of ways of fixing it, so design is not a big deal).