“There is a practical reason for P1”

It is this:

Most of the general public is not photographically literate enough in various parts of the non-visible spectrum to be able to judge what is “misrepresentative” for all varieties of that imaging.

The general population is quite familiar with how normal photographs “work,” and most people can “read” a single-exposure, undoctored photograph without difficulty.

(TTG is actually built on this ability; see “A” here.)

But the general population is not at all familiar with many varieties of “non-visible-spectrum imaging” (for example, it usually takes a trained specialist to read an MRI scan without misinterpretation).

P1 reflects the reality that there are few forms of non-visible-spectrum imaging that the average citizen is adept at “reading” and interpreting.