As a web developer I run a local instance of WordPress on my machine, and out of the box you can NOT take advantage of WordPress’ auto upgrade/update feature. If you open a terminal and update the file permissions this will resolve that issue.
$ cd //Sites/
$ sudo chown -R _www wordpress
$ sudo chmod -R g+w wordpress
This way, the WordPress directories have a permission level of 775 and files have a permission level of 664. No file nor directory is world-writeable.