Is Portknocking Real Security?

In a recent article of mine I put forth that obscurity can be used as a layer to bolster true security in a useful way. What follows is a thread on Reddit.com with someone arguing the opposite with me.

I’d love to hear what you guys think about these two viewpoints. I’m specifically looking for others who agree with him and not with me.

[ Reddit.com: Portknocking Security Debate ]

[Edit: Oh, and be sure to check out this thread on the topic at DSLR security ]