I was actually thinking about the lack of SQL alternatives using the postgres engine; for example, why is datalog not simply available as an extension? Or MySQL syntax? PG implements a wide array of alternatives to PL/pgSQL (including standard programming languages eg python), but for whatever reason these SQL-alts never seem to consider being layered on top of the postgres engine.

However, the lack of GUI frontends is also really weird. I don't see why it'd be harder to support than any other DB, and afaik pg has gotten fairly popular..