“Stupid” is relative. Often, when designing a system, I did not have enough information about how it will actually be used (and in some cases - neither did anyo

“Stupid” is relative. Often, when designing a system, I did not have enough information about how it will actually be used (and in some cases - neither did anyone else; when you create a market all you have is guesses). Things I was sure weren’t important turned out to be important, and vice versa. E.g. in one of the systems, prior business analysis showed that legally valid “chain of custody” would be an issue, which dictated very specific (and often costly, performance wise) decisions. And then after the 3rd customer deployment, it turned out that they don’t care - they’d rather pay less for everything, and lose every 20th claim. And after the 20th customer it was proved beyond the shadow of a doubt. It was stupid to believe what customers said ahead of time, yes. But I don’t think that’s the kind of stupid you are Referring to.