And to continue your metaphor, most software estimation comes from someone describing a car they like, and based on your mock ups you and others decide on a pri

And to continue your metaphor, most software estimation comes from someone describing a car they like, and based on your mock ups you and others decide on a price, how long is acceptable to build, etc. So then you goto build the car and everything's going great till you find out that the latest research shows the specific design of engine you're using doesn't work with the eco friendly fuel that is now being mandated by the government. And suddenly killing cows is uncool so you have to change all your chairs to fabric or source fake leather, but half of your company thinks that endorsing fake leather is hide-appropriation and you're now spending a third of your time in HR going through training. And eventually you get about a week out from delivering the car and the customer calls your PM and says they want the car to have a top speed 30mph over the original specs while maintaining the fuel efficiency rating. And the doors should swing up, instead of out. Like billionaires'.