We discuss subjective stuff all the time. There is no reason not to.
Sadly, we also spend most of our time having to try and explain the difference between subjective and objective reality to people. And that is a PITA. To anyone who can distinguish between subjective experience and objective reality, I'm more than happy to exchange ideas and opinions.
When controlled listening is advised, it is so people can verify the possible differences between what they think they can hear, and what they actually can hear. It's a big part of subjectivity to learn about and understand our senses, and cognitive biases. How can we hope to understand fellow humans and ourselves without first getting the measure of how much those biases influence our experiences and how differently some can impact different people? Only by discussing various subjective aspects of a human being can we better understand them, IMO. Science has never tried to repress subjectivity, it only cares to draw a line between objective and subjective reality when there is one to draw. If the question we try to answer is objective, then indeed, subjectivity probably should wait outside so it won't influence the result.
Enjoying a R2R NOS DAC or some amplifier with 4 or 5% THD, Or vinyls, or Beats by Dre, or anything that's not the objective best choice for fidelity, isn't a fault or a mistake, it's a matter of personal taste. There is no wrong taste. But there are false objective statements.
If
@Diet Kokaine had just said he really enjoyed his R2R DAC, it would have been a better message in support of R2R designs than any of the BS he's been posting to demonstrate rhetorical skills inversely proportional to his arrogance.
Anyway, opinions and subjective discussions are welcome in the Sound Science section. What would even be the point of a hobby about music that can't talk about the subjective experience? It's declaring objective facts based exclusively on casual impressions that cause endless issues.