This is also the reason why I avoid using analogies when making an argument. Usually, instead of talking about the argument itself we end up discussing under what circumstances the analogy works and when it doesn't.
Ironically, Segal's Law, which you seem to approve of, is itself an analogy. I don't think anyone here is really concerned with knowing what time it is or whether or not it's a good idea to wear two watches.
Analogies are so powerful that you can often prove both X and not(X) simply by finding the fitting analogy.