[BunsanSpace]

Just because a brand isn't "mainstream" doesn't mean they're small.

the root of the issue is audio is highly subjective so what sounds good for you may sound awful for me. Confound that with other variables such as amps and dacs (tubes, class A, "warm" vs "cold") and it's a total mess.

Second headphones ARE measured with a clear metric, you have frequency response graphs and distortion graphs which paint a objective picture about how the headphones sound.