It's just another fade. If you can make an inner fade hinge, you can certainly make an outer one bend.
Your point is probably more geared towards the way a bowyer typically makes a Mollie with the width tapering abruptly to the lever.
The originals were actually much more graceful. I'm not sure what generated that practice of guys making the outer taper look like a fade one might expect on a pyramid bow handle.
It's almost like someone sketched a rough outline as a starting point before refining and most people just leave that outline.