I tested an AI humanizer (I hated it)

My agent wrote a short design proposal in DeepSeek V4.1 Flash, and I ran a humanizer skill on it. It fixed a few small things and left the real problem alone: the writing was still sloppy. A humanizer can sand down the surface, but it cannot add the thinking that was missing. I would rather write the section myself and use Co-Span to edit it than send polished AI slop to a colleague.