Mr Average, your clearly not a musician if you think that. However, back to flying. I have flown for over 40 years and have approximately 12,000 hours or so instructing. I've been assessed for one reason or another most of these years. If the examiner has no criticism or feed back for me I feel cheated. A critical and knowledgeable observer is your best friend. Skills need continuous attention and knowledge evolves. The cousins Sod and Murphy feed on complacency and this should never to be forgotten.