Each review catches different types of disasters at different stages. Skip any of them and you’re gambling with your company’s money and reputation. Here’s when to use each one and what disasters they prevent.
Submitting a proposal that looks professional but doesn’t answer the customer’s real questions or differentiate you from competitors. (The kind that gets “technically acceptable” scores but loses on best value.)
Submitting a proposal with fatal flaws that could have been caught, or worse - submitting when you should have withdrawn because you discovered you can’t win.