In our lineage of Wing Chun, the intensity of Chi sao practice increases as the student develops. This ends up in the use fists, palms, elbow, legs, knees and feet, as striking and Chin-na/Kumna tools. This in turn leads to full on sparring that by the way, maintains "sticking" skills from intense chi sao practice together with correct rooting, if not exact stances.
So, in a real fight one ends up using kung fu and not kickboxing inspired approaches. Incidentally, in Chow Gar, one is meant to immediately "sink" before going into action, if a fight is imminent.