WRONG. This is why designers shouldn't be "redesigning" stuff they don't use.
Branching and merging with ease is what makes distributed scm's so much better than the previous generation. Why would one want to de-emphasize this?
And let's talk about what really used. Github is great for viewing code easily and making comments. So what did they do to the code view div in the latest redesign? They made it smaller! Unbelievable!
So now I have to use a Chrome plugin to fix it: https://github.com/sauravc/github_wideload
These "designers" aren't entirely to blame though. A lot of what the author suggested makes things better. Unfortunately, coders are a tough crowd to please.