Maybe there needs to be third classificiation: the audio realist. Somebody who foremost believes that science, measurement and blind testing tells us what is audible and what isn't. This person also takes into account his or her's hearing ability, listening conditions and preferred music: some measurable differences don't make any practical difference and as such don't necessarily warrant spending a lot of extra money.
The ideas that you need ruler flat freuquency response, huge amounts of headroom, bass the reaches low teens and of course SINAD of way over 100 are borderline subjectivism in my opinion. If we want to be the voice of reason in for example the newbie area then it must be made clear that some Genelec The Ones or big Revel floorstanders should not be considered necessary or probably even resasonable if you are mostly interested in the music reproduction AND are working with somewhat average budget, in somewhat average living conditions.
Audio realist can of course spend any amount of money for state of the art equipment, but he knows what he is getting into and accepts it.