I think that no sensible rule of thumb is possible unless we're specifying a language, because language "density" can vary so greatly. I follow wildly differen

I think that no sensible rule of thumb is possible unless we're specifying a language, because language "density" can vary so greatly. I follow wildly different rules of thumb about everything from line of code count to how many methods per class to whether or not that functionality belongs in a class in the first place, depending on whether I'm writing Java or Python or F# or Racket.