The biggest benefit of HA architectures is IMO not resilience from crashing or overloaded systems, but more that it is often a prerequisite for doing zero-downt

The biggest benefit of HA architectures is IMO not resilience from crashing or overloaded systems, but more that it is often a prerequisite for doing zero-downtime updates and partial rollout of updates. No more emergency revert to last version because the new version didn't start up, only to realize there was a schema update so you also must restore your data from a snapshot, which nobody knows how to do. All this under stress from the service being completely down.