You know how BSD advocacy folks like to tell you they "don't like politics"? It's kind of like the story in the Onion about that guy who keeps telling people he doesn't own a television and how much more fulfilling his life is, even when no one asked. BSD advocacy folks are _just as political_ as the GPL crowd.
The reason to use GCC isn't performance, it's the only free compiler that supports a multitude of target architectures. And that's very very useful. Dropping utility over licensing kind of smacks of the thing GNU is accused of when BSD advocacy folks get all snooty about technical superiority.