The author shares insights into macOS hardening after transitioning to a new MacBook. They emphasize that the traditional concept of "perimeter security" is outdated. In the past, security relied on physical boundaries, but modern threats require a more nuanced approach. With the rise of cloud computing and cybercrime, the idea of securing a system has shifted from building walls to creating depth in security measures. A key point is that perfect security is unattainable. The author stresses the importance of understanding risks and the likelihood of compromise. They outline a personal threat model that includes protecting intellectual property, public image, and personal data. The discussion includes risk assessment strategies, warning against over-reliance on consultants who focus on business impact analyses, which can shift responsibility away from the individual. The author advocates for "defense in depth," where multiple layers of protection are employed to mitigate risks. They offer practical examples, such as using antivirus software alongside services like VirusTotal to analyze downloads. This layered approach aims to ensure that if one security control fails, the system remains protected through other means. The article highlights the need for a proactive and personalized approach to security in today’s digital environment.