Then what's the point of having it? I have seen enough destroyed CBs in my working life to be just a bit leery of them.
Then you might as well get the whole home genny. Much safer.
The point is the portable is much cheaper, you can also use it for other things, it's a lot less work to install, and you can take it with you if you ever move.
Those things obviously won't be important to everyone, but for someone like me who is low on cash at the moment, the portable option is sounding pretty good. Plus, I live in an earthquake area so if I ever need to use it for an extended period of time, chances are there won't be any natural gas anyway.