They do include the patch notes when you log in, but as Bundy pointed out, some people like to read about patch notes before they install it.
A fun game could be, 'what will that zeph dude say next'. In response to the above post, it could be something like:
"If people want to read the warcrap patch notes every week before they install it why not just go to the website. And if the update is automated, what does it matter if you read the notes before you install, since you have to install the patch anyway? This isn't news."
It could go on and on!