If you want to quote an essay, then write a blog post and quote the essay. Linking to the reference material, putting in the wrong title, and then commenting about the one sentence you wanted to discuss is not only unclear, it is against the submission guidelines.
One of the most valuable things my father taught me is an old Yorkshire saying: where there's muck, there's brass. Meaning that unpleasant work pays. And more to the point here, vice versa. Work people like doesn't pay well, for reasons of supply and demand. The most extreme case is developing programming languages, which doesn't pay at all, because people like it so much they do it for free.
and I suspect creating agent harness might be the same thing like creating new programming language. Which most engineers would love to do but no one want it.
Correct. You have studied Paul Graham well. In this case, we do not need more agent harnesses and it seems to be a recurring hype that little to no-one wants.
Unless they own the model and close down the agent harness, the majority of the open source harnesses won't make any money.