Surgeons are the motte of occupational licensing; hairdressers are the bailey.
Strong upvote. And it’s reversable too! Hairdressers are the motte of reducing regulatory hurdles, the huge spectrum of trivial to important is the bailey.
Plumbers are a good example of the middle ground—someone untrained and unfamiliar with code can do a lot of damage, and will be long gone before it’s discovered. Requiring a bond is just delegating the regulation to a bonding company.