I could be mistaken, but on the "no brakes" subject, I don't think they are referring to simply a rough road, but rather one which contains sharp peaked ripples, or what I've alway called a "rub-board" road (like old folks used for washing clothes before 'lectricity). With or without ABS, if you are unfortunate enought to be in this wrong place at the wrong time, you probably aren't going to stop in time no matter what you've got for a braking system.
IMO, this brings another important component into this equation....suspension. If the wheels are staying in good contact with the road surface at all times, any braking effect is more effective. If the wheels are hopping all over the road, you ain't gonna stop. It all works together.