[radiator]

This is most probable. Oracle specialists tend to be people who have been working with Oracle and Oracle only for the past years, if not decades. They could never possibly have a knowledge of the full functionality of Postgres, which coincidentally changes rapidly.

[rconti]

Couldn't this also be said about, say, Postgres specialists?

[radiator]

Not the same percentage of them. Postgres has been used for a shorter time in large companies. Many experts in Postgres were previously experts in another DBMS.

In contrast, most Oracle DBAs/Engineers publish the fact that they have only used this specific product during their whole career. They seem to be rather proud of the fact, actually.