@rauliruegas you left out this bit:
Since then I've seen this simple fact play out again and again. Now we all know that if a cartridge isn't set up right it can have more distortion- and this is easily measured. And we also know that some arms simply won't allow you to set up a cartridge correctly as some of the adjustments needed to dial it in simply don't exist. So its not stupid- in fact I am suggesting quite the opposite: if you can't set up the cartridge properly you are leaving performance on the table! This should be really obvious to any audiophile...