Earlier quoted context omitted.
If an invention cannot be "reduced to practice", it is not patentable. My understanding is that reduction to practice means the invention has been actually built by the inventor, or that it is fully disclosed in a patent application such that a reasonably skilled person could construct the invention. If an invention hinges on some entirely theoretical concept that can not be demonstrated by even the most highly skill…
If it can’t be built, how does the patent harm anyone except the one who wasted their money to get the patent? There will never be a licensee or infringement to sue over.
That is not morally right. It also isn't the intent of patents, because it does absolutely nothing to further the progress of the useful arts and sciences.