Automatic is almost always better, and is the primary method. The refresh tab is there to indicate that something has to happen for there to be a next step, and it needs to be functional in order to not look broken. However, a job seeker will use it once or twice and then realize that it is redundant. At that point, their experience trumps the redundancy and they move on,happy to have the discovered shortcut and to save a mouse click.

However, the inexperienced user needs the crutch. It's the same type of interaction used by Google for their search field.