ez! I work for a company that builds a SaaS end to end product.

Myself and my coworker were asked to build exports for a single client. They were json exports. To start the client would take weeks/months to get back to us, their spec was very vague and their exports had some really complex logic to sort data. We'd been going back and forth with them for almost a year when they said we should give it to them "as is". They now are the proud owners of 2 complex broken exporters.