I think for the most part fwhr is a cope after looking at a graph posted on another site. It's also quite useless if you only rely on that to gauge attraction.
But, from data, it seems like you can have low fwhr, and all that's going to do is make your face look more unique, but your attractiveness can still be high or low just as if you were in the so called ideal range of 1.8-2.0.
Falling in the 1.8 - 2.0 range just makes you more common. If your fwhr is greater than 2.025, only then can you use it as an excuse for being ugly.