Fortunately, Ray Rhamey can explain it. And he offers an excellent reason for writing that way:
Consider why you might want a close third person point of view. It's to involve your reader with your protagonist. To create an emotional bond, some form of caring. Why? If the reader cares about a character, they're a whole lot more likely to care about what happens. And motivated to turn the page.
More than that, the closer you can bring a reader to a character, the tighter the emotional connection and involvement, and the closer you bring a reader to experiencing the story rather than just reading information.
Because I'm writing to primarily to entertain myself and not to tell you a story, POV isn't something I ever think about. When I'm writing from the hero's point of view, I simply become the hero. If he's worried or ticked off or charmed, I'm right there with him. I'm not likely to make a POV slip because I'm not writing about him, but myself; I am experiencing the scene right along with him. I'm living the story, so deviating from his POV is no more likely than my spelling my own name wrong. (Not that errors don't sometimes crop up during the rewriting and editing processes.)
I call that "method writing," and while it obviously comes naturally to some writers, I suspect it's something that can be learned by most others. Those of you who write fiction, do you try to imagine what your characters are feeling, or do you know what they're feeling? And if the latter, is slipping into your characters' shoes something that came naturally to you, or something you had to learn?