Rise, sink, spit, swallow are common keywords in mainland Wing Chun families. They describe action and energy (force vectors). And if you're trying to do these motions from the positioning and usage of body you might be coming from, I could agree with you - just as in reverse others might find yours loosing structure as well. It all comes down to what "structure" and "using it" means to you. They tend to have more active hips, that are not locked or tucked forward, but "float" and get put in use. It depends how everything is fitting together as a whole. Its like arguing about a Tan Sao shape and its angle and positioning. One of the first things people saw at the frist Friendship Seminar is that arguments on that became straw man arguments and made little sense. The way each person did their tan sao and used their tan sao made sense for them and their engine, and little sense taken out of that and put in to another person's.