I didn’t turn down a dev freelance project when the client decided against going with best practices because the solution I offered was a well-established design pattern but created a need for a financial management change she didn’t like. I stupidly built what she asked for. It worked fine in the 3rd party vendor test environment but failed on production. After hours of analysis of code to ensure no changes happened to my source during test->prod deployment, and the vendor denying they had config differences between them, and the client refusing to pay, all I could do was abandon the project.