The subject of this thread is almost click bait. I've resisted for a few weeks, but it looks like I lack the discipline to stay away. There is so much wrong with this discussion right form the initial premise that it's not even really worth unpacking. I could demonstrate and sort all of this out for you in person in about 10 minutes, TMA17, but this thread will go on for 30 pages and you will learn NOTHING, but probably believe that you have, which will lead to more posting of "facts and conclusions" that you've reached about Wing Chun.
Prior to Wing Chun I spent decades doing and dabbling in other systems and ring sports. Between classic western boxing and Muay Thai, I suppose I trained for a good 8 years or so, which doesn't make me an expert on boxing, but since that appears to about 8 years longer than you have with Wing Chun, I guess that shouldn't stop me from expressing my observations about it.
I can honestly say that the sweet science of boxing doesn't need ANYTHING from Wing Chun. Boxers need to train as boxers and get experience boxing. If they're in a rut, there are other coaches and other gyms that can help them move forward with boxing, but I can't imagine how anything from Wing Chun would make a boxer a better boxer. To me it is a ridiculously uninformed premise.
Conversely, Wing Chun doesn't need boxing and isn't compatible with it. They are completely different constructs. The second that a Wing Chun player starts trying to function like a boxer, the wheels come off....which is, by the way, why You Tube is full of Wing Chun guys losing boxing matches. It's not what we do or aspire to do. If you want to be a good boxer, you need to study and practice boxing.
If you mix Wing Chun with Boxing, you get a different system...JDK perhaps, which is fine, but it is neither Wing Chun nor boxing. It is something different. You don't take the front differential off of a 4x4 and bolt it on the hood of a sports car to get something special. You get something that makes no sense and disparate engineering solutions that serve no purpose as assembled.
Wing Chun forms have nothing to do with shadow boxing. Nothing. ....nothing. I realize that everyone's opinion is equal on the internet, but that's just uninformed. It shows that you lack and understanding of the role of forms in Wing Chun AND shadow boxing. Actually what it shows is that you watched a YouTube video and became convinced that you stepped forward years in your knowledge of something that you just started training. You will find your echo chamber on-line, but people who actually understand these things aren't fooled by how emphatically you state this as fact.
And, I don't get wanting to figure out how to make Wing Chun work better in MMA. If you're interested in MMA, there are tried and true ways to train for it. Why try to retrofit something for it that was not designed for that. You can make a fish tank out of an old TV set, but it's hard. It's not what they were designed for and you could also just buy a flipping fish tank...or study up on how to make fish tanks. There are professionals and professional methods for doing so. This is not a problem to be solved. You can't skip over the part of actually learning something and just right to the part where you innovate perceived shortcomings with it.
TMA17, if you have a good teacher and want to learn Wing Chun. Stopping posting things about it on the internet that you don't understand, put your head down and learn it. If you don't believe in the system, why are you studying it? There are a million other things that you could be doing. The art wasn't stalled and waiting for you to come along and fix it based on stuff you've seen on YouTube.
This is the golden age of martial arts, in way. Do something you like. Anything worth doing is going to require you to dedicate yourself to learning it. You can't skip over that part, even with the internet as your guide.