@chayro We had tons of equipment back in the 70s with the lowest measurable distortion possible. One of the founding principles of high end audio was to prioritize sound over specs.
Perhaps (I thought it was more like the early 80s, and as always I am happy to be corrected), but I suspect that technology and knowledge has advanced since then to accommodate such characteristics in general without the pain of fingernails on blackboards.
edit - folk who have amps from the 70s may recall, for example, amps such as Marantz, Sansui and many others being capacitor coupled. I’d like to see those (refurbished, of course) put over the measuring bench.