Ian, G3SEK wrote:
"..It`s more about encouraging people to think for themselves."

Why shoulld people worry with reflection coefficients or SWR?

Terman says:
SWR is important because it is easily measured, and SWR directly
indicates reflection in a system.

Reflection coefficient is defined in my dictionary as:
The vector ratio between the electric fields associated with the
reflected and incident waves, at the junction of a uniform transmission
line and a mismatched terminating impedancee.

Other planes and junctions producing an impedance discontinuity are also
cited as producing a reflection and thus a reflection coeficient.

The dictionary quantifies the reflection coefficient as:
(Z2 - Z1) / (Z2 + Z1)
where Z1 = source Z
and Z2 = load Z.

Absolute values are used above for the reflection coefficient when
relating it to SWR.
This is the voltage divider fraction.

Terman says on page 97 of his 1955 opus:
"Reflection coefficient (rho) = (VSWR-1) / (VSWR + 1).
"S" ---sometimes called (VSWR) to distinguish it from the standing-wave
ratio expressed as a power ratio, which is (Emax / Emin) squared.

best regards, Richard Harrison, KB5WZI