Be careful when looking at real fighting and saying what is is or isn't wing chun. Wing Chun done for real at full speed with the adreneline pumping facing someone that wants to hurt you is not going to look like class.
Also we all are the same 2 arms 2 legs. Wing Chun concepts that work will appear or come out in other arts just as things you may usally see in other arts will come out in wing chun.
As for the rear leg weighting . Not all wing chun uses that exclusively. 50/50 footwork is used in the knives and some front leg weighting can be found in some pole and knife forms as well.
Also we all are the same 2 arms 2 legs. Wing Chun concepts that work will appear or come out in other arts just as things you may usally see in other arts will come out in wing chun.
As for the rear leg weighting . Not all wing chun uses that exclusively. 50/50 footwork is used in the knives and some front leg weighting can be found in some pole and knife forms as well.