rqlite isn't competing with Postgres since postgres does not provide any mechanism for highly available + serializable consistency and that's what rqlite gives

rqlite isn't competing with Postgres since postgres does not provide any mechanism for highly available + serializable consistency and that's what rqlite gives you. Postgres does have replication out of the box but it has a bunch of limitations meaning you have to manage it yourself (ddl isn't replicated I think). And the replication will not get you strict serializability.