Defining what is proof by a preponderance of the evidence by only citing the Federal Rules of Evidence makes my point. There are countless definitons depending on state. Once upon a time, there was a definition that was British. It was simple. America's vastness and number of colonies then states makes the issue of definition very difficult. It varies from state to state. Besides the geographical variety, it varies by time. Many years ago you needed an advanced legal degree to understand the words used to explain the rule. Most lawyers did not understand the rule. I will publicly admit that I am one who still doesn't understand the rule.
Besides the language in the Federal Rules of Evidence or Federal Civ. Pro rules, hundreds of cases further define the rule. No one can remember all the definitons. How a concept is worded makes a difference in practical application. When you read legal material, you should be aware that there is a point where normal life may change the rule.
I believe I have a sophsiticated understanding of the rules from years of reading and practicing. Do I understand it completely? No way. The only people who fully understand it are law students with no experience.
It is not good when normal business people, tenants, whatever have no clue what a law means. There are not enough lawyers to deal with the problem. Normal life requires understandable rules that every day people can comprehend. Not everyone needs an advanced degree in law to live life. Perhaps B.c I grew up in poor neighborhood I knew something when I was in junior high school. McCrory's, Woolworth, stationery stores sold forms for about one dollar. Many business people cannot afford the cheapest lawyer. An important segment of the economy functioned with no lawyers. The basic concepts are easy. There were some disasters but it functioned well for the most part. If I did not have that exposure when young, I would prob. argue not to leave your house without a lawyer. Law is complicated. Some lawyers are so bad you might be better without one.
A month ago I passed on some quick nuggets of info for graduating law students. In your personal life, don't spend hours researching the way you do in school or work. Just rhrow some general terms from first year. If you need more complexity, you can always go back and do the research. Why waste hours when you can have a good time? I can do U.S. Supreme Court landmark case, This was my school's strength. Complicated and important. I never was taught everyday law such as basic contracts, simple house closings. More people need help with the so-called simpler subjects. I love doing complicated work. Yet I bungle the simpler tasks. Someone from an elite law school is not the person to hire for basic life. We are terrible at it.
I was forced to learn how to not escalate, not research, not complicate matters. It was very hard for me. On the other hand, I don't think the lawyers who attended schools that specialize in basics could do advanced law.
Law works for law. It does not good for normal life.