One difference is that many "programmers" actually don't do any programming at work. Their hands on experience is a 5 week java course in uni 10 years ago and after thay they have been stuck in meetings or writing brain numbing CRUD in a proprietary domain specific scripting language at $bigco ever since. The only way for many to get actual hands on is to do side projects.

Hair dressers don't have this problem, they are actually cutting hair 8 hours a day.

Carpenters have a more hands on education compared to compsci which is more maths than version control.

Doctors require 2 years of practice supervised by other doctors before they are certified.