We run all our databases in K8S, approx 80 DBs. We're a fintech that requires HA so all databases run with at least 3 notes. Maging DB clusters with K8S only requires 1 file.

If we need to increase storage this can be achieved in minutes, if we need to take one node down we basically can do it anytime during the day..

Every now and then we discuss moving DBs to AWS RDS (or equivalent) however for our transaction volume RDS costs are prohibitive.