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What limitations does Postgres have that would cause you to use another data store?

Or what big feature / functionally is Postgres missing (if any, like replication?)

Assuming you mean replication (as defined in https://www.postgresql.org/docs/current/warm-standby.html#ST... or https://www.postgresql.org/docs/current/logical-replication....), then PostgreSQL has it (see those docs for details). If you mean something else, could you elaborate?

Replication for sure

Would you mind expanding on this? In what ways is PG's replication support lacking versus the competition?