How about how to file a motion or how to know when you object to certain aspects of the prosecution? Does the layperson know how and when to do these things? :idea: Being a lawyer is a trained still just like a plumber or a carpenter.
Do you do your own electrical work or do you call in a professional? :think:
Why is any of that necessary?
If two or three witnesses (not necessarily eyewitnesses) are enough to establish a matter, as God says, and if the law is simple, then would not the best system have a judge, the witnesses, the accuser, and the accused only?
Lawyers are only needed when the law is complex and many volumes thick, as our current law is, which makes it difficult for the average person to know all the laws.
If the law is simple, then there is no need for lawyers, because everyone knows what the law says, or a the very least, is aware of all the laws.