I've seen more outages (or worse - silent data corruption, inconsistency, or deviations from the intended business rules) due to home-brewed, horizontally-scala

I've seen more outages (or worse - silent data corruption, inconsistency, or deviations from the intended business rules) due to home-brewed, horizontally-scalable engineering playgrounds having a flaw than a good old Postgres on bare-metal hardware suddenly going dark.