Your post definitely was worth submitting as a topic, agreed. I don't think that it's worthwhile too often, but in this case it's thoughtful, well-written, and interesting. Better than most blog posts I've read recently.

I had a comment of mine submitted as a post a while back, and I was very grateful - I thought the comment was worth a post. If comments are valuable stories, then, I don't see a problem at all with your self-submitting this one.