A regular triangle scarf or shawl, knitted from the top centre out is much easier to design. Here's why. The edges of such a triangle grow symmetrically. Have a look at this stunning example. See how each side of each triangle grows at the rate of one new stitch every right side row? In a crescent scarf, like my Fibonacci, the inner edge grows as above at the rate of one new stitch every right side row,
P.S. I almost forgot to show this.
P.P.S. For a reader who asked (via Ravelry) to see what the new shoulders in the Wheatsheaves cardigan look like.
It's hard to get a photo of shoulders when no one is in the sweater! But, I think you can see how nice and smooth the shoulder area is now, with no seam to get in the way and the short row shaping doing all the things it's supposed to do.