I know people in the music field that always use a student’s “cheap junk” during lessons and sound great on them.That’s the stupid egos of the paying customers. I would rather have an instructor take an off the shelf $500 plastic gun with cheap ammo from the student and hit the bull eye 10x with an inch grouping at 25 yards, then an instructor that wants to make me inclusive. I would be wowed by his skills that I would recommend his class to everyone I know. And would just be captivated and learn his teaching as gold
As opposed to bringing their pro stuff in and the student thinking they don’t sound good because the instructor has a 10k instrument.
Oh, no it is not a viola.
Nothing is gonna make that sound good!