I agreed with you until the "fashion" thing.

Yes, Postgres adoption and development really picked up steam once Oracle acquired MySQL and quickly confirmed everybody's fears: they bought it primarily to ensure that MySQL stayed something of a "toy" database.

But the "fashion" thing is needless, insulting, and not even correct in my opinion. As far as mindless fashion trends in the industry go, traditional RDBMS's like Postgres are almost the antithesis of fashion.