But a flawed spec is management's problem, and it is management's job to make a call on whether you ship despite any known flaws. A competent (in the professional sense) programmer will follow management's lead even if they personally don't like the decision or aren't happy with the results.

Being passionate about your work does not give you the right to be in charge, in programming or any other field. Yes, good programmers want to make a good product, but as the saying goes, sometimes the best is the enemy of the good. Shipping a product with fewer bugs six months after the money to pay for it runs out... usually doesn't happen, because the money ran out.