There is a real number of how many people are actually needed for most tasks. To keep kids’ attention, you need a person for every 4-8 kids at certain ages, but it gets easier with older or more mature kids. It helps if that person is pretty smart, so they can handle the flow of events and make effective decisions from moment to moment. It is not as relevant whether that person has specialized training.
There are three areas where this question applies.
Teaching
Health Care
Finance
It should be that way with the law, but there are many vulnerabilities about the law that make it risky for the layperson. However, we don’t consult lawyers to help us navigate our behavior with respect to the law from day to day. And, once we do need legal advice, it does not necessarily need to be from a highly trained lawyer. If the system were more simple and there were protections for self -advocates, advice from a paralegal or other less-trained person would be enough.