It's more that the listener is never going know if it's accurate or not they just care if it sounds good. I think the real issue here is you're arguing for feel and I'm arguing for sound. I've heard that argument go both ways though, some people love the QC feel and others think it's sterile and unrealistic. Me? I'm an engineer and if it's metal I'm going to put a multiband compressor on it and get rid of the junk so the guitars and bass aren't in an eternal death match
Agreed.
There are 3 people you have to please with your sound
1) Audience
2) You
3) sound engineer
I think we are all arguing the same point. Some people take very analytical approach to their sound, others more relaxed - both are equally valid,
Personally I'm useless at sound analysis....I could never work out how to use Mid on a regular amp, let alone, IR's, power sag, definition etc. My point is, I can hear the difference but actually my views changes on what I like by the minute. I don't have the perfect sound in my head nor do I instantly like or dislike unless its really bad. I also have to spend time with a sound to adjust to it. I don;t think I'm alone in this.
The point here is I do think I should care more and perhaps some people should care just a little less.
The audience will of course know a really bad sound - would they be able to tell the difference between the QC and Kemper when set up in a similar way? Nope.
Does it matter? if it does to you then it does.
But note there will be a much bigger difference in the fingers, technique, whether the singer is in tune :). To debate over 5% difference is only important to "you".