Postgres is not a distributed database and doesn't have a single safe default for running it in a distributed configuration, including talking to it over network. It can't claim any consistency guarantee, so there is nothing for aphyr to test it for.
Even common highly available configurations take the route of no consistency guarantees by doing primitive async replication and primitive failover.
Even common highly available configurations take the route of no consistency guarantees by doing primitive async replication and primitive failover.