When we hear a HiFi system that is just plain wrong there's little discussion about its merits. We can all agree it needs some help.
But when systems are good enough to be called great, the differences between them come down to a simple matter of taste. Perhaps system A is to your ears a bit lean in the bottom end. Or the opposite. Or any number of differences we might quibble over.
And that's the point we're all hoping to achieve.
Differences that engender a mere quibble: To bring our system's performance up to where we can confidently say our differences boil down to a simple matter of taste.
What a great place to be.