The problem with this is that it has no concrete or relatable meaning, except for how each of us, individually, idiosyncratically, feels about it. We are right back to the incomparability of interpersonal utility.In other words, a 5% increase in say overall driver performance might mean a 50% jump in perceived realism.
The idea of disproving the law of diminishing returns as it applies to high-end audio is just a hopeless morass.
Imagine trying to prove to other people in a convincing and meaningfully quantifiable way that using a certain kind of sugar in ice cream makes it taste 50% better.
This in no way whatsoever diminishes or invalidates your personal feeling that a 5% increase in overall driver performance might mean a 50% jump in perceived realism. That is totally valid for yourself, and I respect and accept your quantification.
It just means that it's impossible to generalize, and it cannot be used to disprove the law of diminishing returns as a matter of general applicability.
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