Our trade has become less respected :happysad: I agree, in some places in order to just touch someone's hair you must show a license, and to get a hair dresser license takes time, effort, skill ect. Perhaps that's not the issue, but if found running a hair salon without a license, that could cost you. But any handyman can put an add up on Craig's list and perform services.
I think you hit the nail on the head there. How good of a job you do of cutting hair is not really a requirement to be licensed. Knowing how and practicing prevention of spreading disease or parasites that may be involved here is what the licensing is all about. Same can be said about nail salons, massage parlors, tattoo shops, ear/body piercing ....
Now if we (electricians) were to install wiring on other humans, we may need to have licensing from the health department as well.
Wiring we do install in some places like mentioned here, as well as health care facilities, and even involving food handling applications needs to follow guidelines from the health department, but when those health inspectors do find something that is an issue with the wiring usually request the owner to correct it instead of issuing any kind of correction notice to the electrician.