Re: Of course they're testing it again
SpaceX also benefits from not having to worry about people riding on their rockets. Redesigning the shuttle engines to work around the weak points that caused them to need a lot of refit effort to reuse them would have been made a lot harder by the man rating. SpaceX has a lot more leeway to rework and try different things without worrying about killing people.
They want to launch people one day, but they won't worry about that until after they've got the reuse thing figured out (or found out it is nice in theory but impossible with our current technology in real life)