Now you are sounding more like Leung TingStupid question? Of course it is! And, as one of the most brilliant professors I ever had liked to say, "The only really stupid question is the one you don't ask". In my branch or Wing Tsun, the "true" dummy form is taught only after many years of training and completing the three empty hand sets and their applications in chi-sau and fighting. However many sifus have students practice particular movements and sequences on the dummy. This can be very helpful in refining technique since, as Qwksilver often notes, the dummy can act like a protractor to correct your positioning. Right now I don't have a dummy set up and I really could benefit from one. Anyway, see what your sifu says and let us know. Happy training.
'True' wing chun? Absolute nonsense
His question was not stupid - I have that question asked all the time
It is a valid and important question