Except its not been proven an ineffective method. Again, if the chun guard is ineffective because people got beaten while using it, then the boxing guard is doubly ineffective as many more people lost using it. Those boxers lost because they were punched, so clearly their guard failed.
Come on people, think critically before we all end up living on rafts, its not that hard. Look at the problem and just consider the causes that got you there. And don't stop at the first one.
Wing chun guy loses fight NOT= Wing chun sucks OR elements that (in your untrained eye) make Chun suck.
WHY? Because individual's train to win fights and a better opponent does NOT= a better style. No rocket science involved.
Drop Bear asked if any chun guys have fought anybody good using the chun guard.
The question he should have asked is have we seen any chun fighters with comparable training to their MMA opponents?
Strength, speed, stamina, number of punches thrown, number defended, time sparring etc etc etc
That is the only question that matters and until it's been answered in the affirmative we can't even begin to examine fighting style.
Wing chun and it's various components may all be useless but right now it is not even remotely proven.
Please FLG think deeper.