we are dealing with living opponents, not machines.
Yep, physics is great. But at the end of the day, good Wing Chun is for dealing with human beings, not machines. It's not just about how the physics can be measured in a lab, but how it can be applied in dealing with a real person.
The process cannot be claimed to be "proven", until it is applied and tested in real life.
Plus, even if the theory is sound, it has to be tested and fine-tuned, then be tested more.
Any scientist can write a hypothesis; fair enough. But the scientist cannot claim it "proven process" until proper testing is done and data supporting the effectiveness can be reproduced.