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its not a "build-in flaw" per say. in reality one can only estimate time-frame for a creativity. accuracy in estimation is gained with experience. on the other hand when you do lots of similar stuff, like cookie cutting you usually know how much time particular task will take.
alot of times what happens with designer's prediction is at first they go with most optimistic outlook.. then many things in between estimated timeframe and final result may go south. lost of motivation for whatever reason. client being to cheap and too hard, "family matters" etc etc etc. and the overoptimistic expectation meets a missed deadline. but if you agree to a specific time - you better deliver by that time, there shouldn't be any excuses. you shouldn't agree to unrealistic dates otherwise.
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