"Ideal performance is ideal performance" and take the best of the best, right?
The reality is, a trumpet player 170 miles from the closest lessons teacher is not going to have the same opportunities for quality instruction that a trumpet player 1.7 miles from a major-tier university is. That's why we have these different classes.
And if you think "ideal tone quality" is agreed upon by ALL musicians, simply ask the question: "Should a horn player use vibrato?" and see what happens.