[hinz[_2_]]

Can it be said that treble needs to be cut in a mix if the recorded
material is deficient in some way? I mean some live recordings of rock
bands for example, with roughly recorded setups, where the mix seems to
be turned 'low-fi' on purpose to make the deficiencies less noticable.

I used to think that it was just that the gear used in the 60s/70s
didn't pick up above 14kHz say, but that seems to be untrue. Rather the
highs are cut in the mix as a choice.

Another example: Take the Dark Side of the Moon album recorded
masterfully by Alan Parsons, he was able to keep all the high
frequencies in 1973, whereas the follow ups 'Wish you were here' and
'Animals' are dull sounding in comparison, even though the recordings
were made later with newer technology.