Several reasons. Managers want to believe that programming is like installing a kitchen. It should have a clear start, middle, end, and a reasonable estimate of

Several reasons. Managers want to believe that programming is like installing a kitchen. It should have a clear start, middle, end, and a reasonable estimate of time and cost that could almost be written in a contract. Devs don't want to admit they never installed a kitchen before and need to research the topic first, because if they do the job will be given to someone else who is willing to say they install kitchens all day long. Oh yeah, managers also believe that changing the counter top from marble to granite in the middle of the project should be free, because, hey, it's software.