FWIW, and IMHO, allthough KCBS extolls the bite mark standard, I have found that cooking JUST beyond that point is a way to a successful competition rib. That is also what I am for at home. YMMV.
The real issue for many home cooks is, would you rather have an over done or an under done rib. I would MUCH MUCH MUCH rather have an "over cooked" (falling off the bone etc) rib than an under cooked (tough like dried out chicken breast). "Over cooked" ribs are still delicious.