If you ask the business managers if they want to be able to make changes, they’ll say that of course they do, but may then qualify their answer by noting that the current functionality is more important than any later flexibility. In contrast, if the business managers ask you for a change, and your estimated costs for that change are unaffordably high, the business managers will likely be furious that you allowed the system to get to the point where the change was impractical.
