> They found that Postgres, without tuning, was easily fast enough on low level hardware

Is that production? When you basket it into "low level" it sounds like a base case but it really isn't.

In production you don't have local storage, RAM being used for all kinds of other things, your CPU only available in small slices, network effects and many others.

> If the defaults are fine for a use case

Which I hope isn't the developer's edition of it works on my machine.