I know it’s been talked about, but I don’t remember all the comments. Looks to me like it’s sort of a compromise size between a stock opening and what you can achieve with a cut fender and a flare.
I don’t know that from having taken measurements, it just looks that way to me.
But the key is that you gain a critical amount of clearance on the leading edge of the rear opening. Which is where most of the tire interference comes from on an uncut bronco.
So for a modest size tire they look perfect. If you’re still trying to go really big (which I think you are not) then cut looks like it has more clearance.