Just back from Amsterdam. I attended SREday 2025 with a talk on a mistake we all make sooner or later: Nobody Ever Got Fired for Implementing Multi-AZ. We like to think multi-AZ and multi-region buy us resilience, but the recent wave of cloud outages told a different story. I shared why so many “highly available” setups got away with it by luck, and where the real weakest link usually hides.