Explore the impact and legacy of the SRE book in this 45-minute conference talk from SREcon21. Reflect on the book's influence on production engineering and SRE, examining both its positive contributions and potential shortcomings. Delve into the new working model required for the book's creation, criticisms it faced, and its lasting effects on the field. Analyze questionable assumptions, patterns that may need re-examination, and emerging challenges in reliability engineering. Consider the integration of safety cultures, ethics in SRE, and receive a call to action for addressing unresolved issues in the field.