"Now you're changing things by adding a tuner... the net effect is that the
transmitter is now seeing a 1:1 swr."
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So the sending end impedance is the Zo of the line. What if that value is NOT
what the xmtr needs to see for a match to its output. E.g. The tl has a Zo of
398 Ohms, the SWR is 1 so the transmitter sees a load impedance is 398 Ohms.
May be bad for the xmtr that wants to work into diffrent load, say 50 Ohms or
so.

73 de Jack, K9CUN