This episode explores Joel Spolsky's "unshakeable law" from his 2000 essay, arguing that rewriting software from scratch is the "single worst strategic mistake" a company can make. Listeners will learn why this approach leads to the loss of valuable "embedded knowledge" and can be disastrous, as exemplified by the cautionary tale of Netscape's downfall and the "second-system effect." The discussion highlights the enduring relevance of these principles in software development, even in an AI-driven world.