Sometimes you don’t know where things will end up, so you should repeat yourself with the expectation things will diverge as complexity creeps in. If the system

Sometimes you don’t know where things will end up, so you should repeat yourself with the expectation things will diverge as complexity creeps in. If the system reaches stability and there’s duplication at that point, you can hunt it down by identifying common concepts. Pretending to know from the start where things will end up is silly and leads to very abstract abstractions.