The argument to rid licensing for music therapy or florists (as per article) seems stronger than for a hair salon. Do you know the difference between cutting straight, thin hair and thick, curly hair? What about kinky (usually African American) hair?

If you would like your market to be more than just those clients that request an Army buzz cut, you need to know those differences. My hair, for instance, looks terrible if given a straight chop with scissors. Because it's wavy and thick, it needs "thinning" all throughout its length to make it lie flat. Enforcing practicing on mannequins how to do just that without ruining someone's actual hair seems reasonable to me.