You're all right to some degree, and regarding trust issues with dealerships/techs and the customer. However, I was not in a customer's car. And it IS my job to make sure a car performs to its potential under all circumstances.
With that said, what would you do when a customer comes to you with these complaints;
"When I downshift my Z06 hard into 3rd at over 125, I hear a clunk in the front of the car."
"At over 140mph there's a wind noise from the A-pillar. (BMW)"
"I was in a clover leaf at about 90mph, and I heard a scraping noise.(Z06)"
"power drops off at 8000rpm and WOT." (S2000)
"The transmission makes a noise when I downshift from 6000rpm." (S2000)
"it breaks up at 5500 and WOT."(GS455)
In the high MPH incidents, the customer drives, while I ride (not pleasant). In others, I do what I need to do to duplicate the problem. Or should I just tell them, "don't drive like that"? To me that would be the same as the classic fix-all, "turn the radio up."
There actually are people out there who drive their cars the way manufacturers claim the car can be driven. And yes, there are those who buy high HP cars simply for the status factor.
In the future, I will "keep it to myself."
Sorry, to all those offended.