"There is and always will be a need to present the transmitter with the
lowest possible SWR, regardless of if it is accomplished with a well-tuned
antenna or if that is not possible, inserting an antenna tuner between the
transmitter and antenna"

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Many years ago when transmitters had tuneable outputs, matching cud be achieved
by something called a "pi network" in the transmitter box.

This circuit resonated the final plate circuit and provided a match to the
sending end impedance of the tl. Granted the magnitude of the SWR, i.e.,
degree of mismatch, it wud match wasn't as much as modern day "tuners".

They are not antenna tuners. If they were they wud be located at the antenna,
not the hamshack.

73 de Jack, K9CUN