One iteration of the "if / then" scenario assumption.
The other side but this doesn't fit your narrative / bias. Hi end amp manufacturers assume that folks buying their products will likely use an "after the market" power cord.
Going down that logical route they would stand the risk that their great amp was demoed poorly and got a bad rep or sold poorly. And they'd also lose out on a potential income from offering a cable upgrade with their own brand name on. Heck, not even the marketing people have managed to sell that in. Why? Because they don't want to be seen as peddling snake oil and damage their brand.
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