The only problem is that after the update, the /usr/local belongs to root again. That's easily fixed with a chown though. Apps still have access to the raw UNI

The only problem is that after the update, the /usr/local belongs to root again. That's easily fixed with a chown though. Apps still have access to the raw UNIX filesystem. The only restriction is that they can't write to /usr, /usr/bin, /usr/sbin, /System and into pre-installed Apple apps. Normally, Apps shouldn't need write access to these directories.