I've heard people say this...that it was a shorter ROM...not sure this really is correct.
If ROM is from where the hips and knees (the pivitol points) begin compared to where they end...then I'm not sure that it is shortened. When you widen the stance...both pivitol points become closer to the ground...not just the hips. The ROM seems to be pretty close to the same to me when I think about it...but I could be wrong. I may have to play with it, take some pictures and measure...lol.
I squat wide to activate the hips, hams, and erectors more. Three muscles that are much more important in my sport than quads. It also saves my knees...
B True