Touche, you're right. I should've worded that differently in the moment.

I was trying to come from the perspective of the author, where he tries to argue about difference of appliances through technological means. E.g. using a laser for communication vs using a wifi like transmitter setup.

Both are EM waves but the practicality of the environment with degradation and radiation and the medium that are common for us (gases in the air) make the approach of how to reach the target vibration (in the sense of targeting a specific antenna length on a specific wavelength) harder when trying to use the sub infrared spectrum.

As I wanted to say, I think finding the right material and medium will be a huge challenge in this regard.