Has more to do with credentialing bodies holding legal power over who can practice. If you masquerade as a pediatrician and tell every parent their kid needs an

Has more to do with credentialing bodies holding legal power over who can practice. If you masquerade as a pediatrician and tell every parent their kid needs an hour of exercise and fruits and vegetables, just letting the nurse give the injections, you'll probably do fine in 99999/100000 cases. But that one time you'll miss childhood leukemia because you don't know what you don't know. Likewise, you write SQL injection code and for maybe 99999/100000 visitors you'll be fine. Until the first malicious bot destroys your company's primary DB and you lose hundreds of thousands of dollars in data, and trash your reputation for getting future contracts due to data security.