A hood with a skirt is way too much of a pain to get the skirt tucked in and laid down flat under the wet suit. And if it's outside the wet suit, it just seems like they flip up and are annoying as heck..... And if you tuck it into the wetsuit, but don't get it smooth and flat underneath, then the wrinkles/folds are just creating little channels to let water come in and move around.
+1