Jesus! Get over it dude.
LSJC used in this context is a development drill for beginners in chi sau to learn not to retract the hand before punching and start the process of not chasing or fighting the arms. During chi sau practice we are in contact and the idea of taking the arm away so that your training partner can train the correct punching behaviour is vital. Contact is removed and the punch is trained. It's a drill but the behaviour of the punch is improved through this drill.
Later on down the line this idea of LSJC progresses and like the rest of the system things are added so that the end result is a fully functioning Ving Tsun fighting system. The pivot, step and strategy are all added and all need LSJC inside.
One of the great things about LSJC is that is does teach you to navigate through all the mess whilst driving forward but its not only about impeding arms.
There are many drills and training methods within the system that improve and correct actions. they are not fighting methods. They are tools. If your Sifu has not seen the complete picture or missed certain things the tools become interpreted as something else. This is always the problem.
We learn later that LSJC is about the whole body behaviour but of course in the beginning when we are learning we have to get the arms correct. The structures built through hours of training allows us to use them correctly.
What you see in WSL videos is him explaining a very small part of LSJC. A few more months/years down the line you will see the rest.
In SLT we start to develop LSJC but where is the contact then? There is none so is not LSJC??
I don't need to have a "deeper" conversation with PB mate. I know what I'm on about and have seen the full process. It seems you have not.
When PB first asked me what I thought LSJC was I said it was loss of contact with the arms thrust forward using springy energy. He then proceeded to teach me a new idea. One that made perfect sense and things that I had never experienced before. Before then how could I know any different??????
Maybe you should spend less time writing and invest your time into going to see what PB does first hand before making assumptions based on video footage.
I shouldn't be saying this to you. You are in the WSLVT lineage. You should not be so blind! There is more information out there that you have not been exposed to!