List of reasons is so short... For example since 9.1 Postgres support foreign data tables - other data sources is available for user as regular table; there ar

List of reasons is so short... For example since 9.1 Postgres support foreign data tables - other data sources is available for user as regular table; there are many drivers: MySQL, Oracle, external pg server, and even plain files. Since 9.0 there is support for per-column triggers.