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High Output Impedance On Line Output = BAD DESIGN (but passive preamps)

Virtually all zero feedback designs have higher impedance than normal.
Output impedance higher than grossly one kiloohm will strongly react down to the audio band with the interconnect's reactance to shape the frequency and phase response.
It would jeopardize equipment interoperability.
That's why I do think this concept is not respectful of the customer (who should be clueless about these issues).
Anyway, and even without global FB dividing the output impedance, one can design stages with correct output impedance. It just has to be done this way.

What about a passive preamp?

A passive preamp is not really a preamp. The wording "preamp" is excessive here.
It's just an attenuator and/or switch.
Which BTW has better to be fed by low output impedance sources!
Anyway, you must admit that, while it's not possible to design an attenuator with constant small output impedance without strong attenuation, it's perfectly possible to design a no-global FB preamp with correct output impedance.
Nobody's required to design the impossible (but audiophile quakeries manufacturers). Just let us required them to design the difficult and better ;-)

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