Some saddles are designed to be tilted down, Selle SMP, for example, specifies setting the saddle level initially but states a rider might prefer a tilt in the range of +10/-25 degrees. 'Always flat' is not a universally valid rule.

WRT 2 bolt micro-adjustable seatposts, there used to be a range of copies of the Campi post. Zeus comes to mind. Mine is the 'Arius' brand. It's no work of art, but it has worked since I installed it in 1981. Probably Spanish. The brand has got to be a reference to the Arius who lost out to Athanasius at Nicea 2000 years ago, although the battle raged on for a while. I wonder what the branding gurus think of that.