You gave a very simple example. Lets say the contract is to build widgets that frobulate. What if nobody has ever made widgets that frobulate? What if frobulati

You gave a very simple example. Lets say the contract is to build widgets that frobulate. What if nobody has ever made widgets that frobulate? What if frobulating is poorly defined in the process, and what it means to frobulate changes over the course of the project? What if the government later decides they want widgets that barbulate in addition/instead? The contractor has to swallow all the extra costs, because they were foolish enough to sign a vague/wrong contract? I'm not asking this to suggest a particular answer, just wondering where this strategy takes us.