I don’t think it’s possible to pass on martial arts knowledge without changing something about the original style.
No matter how I might try and copy the instructor who taught me, I’m going to do something different. My arm is not the same length as his/hers, my weight, height, etc...
And if/when I should pass this knowledge on, I will end up changing something. (Subconsciously, if nothing else.)
So, even the classic styles are being modified as they mature.
As for the new styles of martial arts, well, new is a relative term, are we talking the last one hundred years, fifty years, twenty years?
I would agree with Jake Steinmann,”... it depends. ... it’s the teacher, not the style.”
"We forge our bodies in
the fire of our will." Han
from 'Enter the Dragon'