Postgres is configured extremely conservatively by default. While it isn't reasonable to spend time tweaking each database, at least running pgtune would be reasonable for Postgres.
But for many people databases have become commodity applications that they install and then forget. So even in reality not all installments will be properly tuned.
I know it happens because I inherit them often. But seriously knock it off.
Errrrr. Better yet don’t, job stability.
Nothing to see here. Move along.
It seems unlikely to me that this group of people would reach benchmark posts.