Gene Fuller wrote:
"The maximum power transfer theorem describes the impact from change of
the load impedance."

That`s true. When impedances at a junction become matched, you can cut
the matched line at any place and the impedances looking in opposite
directions are conjugates of each other.

It is not pathological to take full advantage of the theeorem. Conjugate
matching is the same as d-c matching except that reactance must be
neutralized not to get into the way of a-c maximum power transfer.

W.L. Everitt is one of many authors who state the maximum power transfer
theorem. I quoted Terman early in this thread. Here is a quote from
King, Mimno, annd Wing on page 43 of "Transmission Lines, Antennas, and
Wave Guides":

If a dissipationless network is inserted between a constant-voltage
generator of internal impedance ZG and a load of impedance ZR such that
maximum power is delivered to the load, at every pair of terminals the
impedances looking in opposite directions are conjugates of each other.
There`s lots more. Read the book.

Best regards, Richard Harrison, KB5WZI