Again, why 20 kHz? The patent application only lists examples of greater than 40kHz -- most are in the range of 50+ kHz. My point isn't that this tech is going

Again, why 20 kHz? The patent application only lists examples of greater than 40kHz -- most are in the range of 50+ kHz. My point isn't that this tech is going to work and change the world just that it's incredibly easy to be pessimistic and to justify it with small incorrect assumptions.