Then you're not using full aggression. Full aggression involves going all out at the person. Which you can't do without contact. I think you didn't express that properly, since IIRC the article stated that there would not be contact. So for instance-eyepokes but stopping short, miming a groin shot, faux-twisting the neck, etc. If that's what you guys do, then that's pretty useless, since you don't know if it would actually land. If you practice a front kick, where you hit the chest or knee (and can adjust the height to the groin if needed), a punch that lands on the chin/upper torso (close to the neck), or the forehead (close to the eyes) or with goggles/groin cup on, that can be useful. Because then you actually know it would land with contact, and getting your strike to land is a lot tougher/requires more practice than figuring out exactly where you want it to land. But if you stop short, you don't know what would have happened (and it also takes away the intensity of the situation, which prepares you less in a different sense for an actual fight). Yup, probably a difference in experiences thing. Unless you come down to NY or I go to the UK we can't really know.