Having grown up in a non bagel rich country, I've been puzzled ever since I first encountered them. What's the point of the weird shape? What's wrong with a square or even circular piece of bread without an inconvenient hole in the middle? For an outside viewer, it looks like someone went out of their way to create a shape that makes it as difficult to deal with as possible, and then mass psychosis took over and ever…
Spreadability of stuff on something isn’t the only relevant factor.
* not a perfect photo, the difference between the thin and thick parts is a bit small, but it’s ok: https://commons.m.wikimedia.org/wiki/Category:Laugenbrezels#...