Often as a developer, you might work on some experimental projects that may not pan out. That's why you try them. They may work for 80% of the use cases but not

Often as a developer, you might work on some experimental projects that may not pan out. That's why you try them. They may work for 80% of the use cases but not for the rest and thus aren't workable from a product standpoint. The sales guys however, may see the "working" project and go out and sell it without asking if it's a product. Example: You get a self parking car demo working. Sales guy sells self driving car based on your parking demo.