Both my bikes have zero offset posts but that wasn’t why I got them. Long years with a Campy two bolt offset post and Ideale leather saddles spoiled me on having the adjustability of the two bolt design.
When I switched to more modern Volt saddles for different frames, the zero offset posts were what I could find in two bolt posts. Turns out the Volt has more range on the rails and can give similar positions on a zero offset post.
Otto