This is a good observation and applies to non-professional skills as well. For example, you can learn to repair your clothes at an 85% level using only a $20 sewing kit and some YouTube videos. Taking a well-loved shirt to a tailor is a chore, throwing it away is sad, but mending it is gratifying. Yet somehow, despite the amount of knowledge freely available on the internet, things like this are increasingly neglected or left to specialists.