That's a good rule. People on this site often make arguments using analogies, and those threads always devolve into arguments about the specifics of the analogy. I have an amazing screenshot I saved where the discussion turns into something about companies hiring clowns to yell at patrons. It's unintentionally comical. The participants are intelligent adults, talking about a domain that they all share some understanding of, yet the crux of their debate is the behavior of some obnoxious clowns.