Writing makes you think better.

Among other things, writing clarifies your thoughts and generates ideas. This guy had a problem and proceeded to write it down so that he could post it on internet to get recommendations. But he never posted it. His problem was solved while he was writing.

Paul Graham writes in his essay, "Writing, Briefly":

"expect 80% of the ideas in an essay to happen after you start writing it, and 50% of those you start with to be wrong;"

So write it even if no one reads it.