> Scale vertically and you're still a single point of failure away from a big, potentially fatal outage. When folks talk about scaling up for stateful resource

> Scale vertically and you're still a single point of failure away from a big, potentially fatal outage. When folks talk about scaling up for stateful resources (database), this typically includes having stand-by replicas to which one can fail over within seconds. Scaling up the DB and scaling out stateless compute nodes is more than enough for many, many use cases. Having a DB machine with one 1TB RAM isn't anything special these days.