I never said don’t tune. I said that if the query performs acceptably under production load and production volumes then don’t waste time tuning that, focus on other code which is not performing acceptably under production volumes and production load. Don’t obsess over a couple ms, focus time and resources on real problems.

30 missing indexes means performance was never good enough. 2 missing indexes that turn a 20ms query into a 15 ms query is what I was talking about. That was a waste of time. Time that could far better have been spend turning a 15 second query into a 50 ms query.

“Good performance” is by definition good enough. If it’s not good enough then it’s “Unacceptable performance” not “Good performance”