Yes. And that was exactly my point. If an idea is just an idea that anyone can have under the shower, there is no value to society in granting a monopoly to that idea. There was no cost to said idea. In that case is better for society to grant a monopoly on a particular expression of that idea (an implementation).

If that idea had cost (say) a billion dollars (like in some medical research or physical research), there absolutely is value in granting a temporary monopoly in order to encourage such research in the future.