I see, but why does it matter if they’re not the same size? Personaly I like to be able to make different sizes depending on how much I 'm going to eat. Or when I’m on a trip/hike can decide to eat a small one first and later a larger one etc.

In Switzerland we even make sandwiches with slices of Zopf/Züpfe (“Braid”), with that you have to make sure to always use two adjacent slices, so that the outline matches 😅 Then it looks like this.

And trust me, Zopf (very subjectively) does not taste as good if it isn’t braided xD