Are patents _required_ to teach a reader how to make the invention? That seems like an interesting requirement that I hadn't heard of before, and I've got a patent with my name on it myself.
> The specification [of the patent] shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same
It's the raison d'etre of patents. A time-limited monopoly in exchange for full documentation of the invention for the long term public good.