How do you effectively categorize the relationship between Site Reliability Engineering (SRE) and DevOps when industry leaders frequently describe SRE as a specific implementation of the DevOps philosophy? Furthermore, while DevOps focuses on breaking down silos between development and operations, SRE provides the concrete metrics and engineering practices to achieve that goal. Why does the phrase "class SRE implements interface DevOps" remain the most accurate way to understand their structural connection?