A better way to understand the divergent transmission of the lineage would be to consider the well known story of the blid men and the elephant:
Blind men and an elephant - Wikipedia
Back to Yip Man Ving Tsun. As it got passed down, sure stuff got changed. Like the story of the blind men and the elephant, each branch of the lineage picked up and emphasized different aspects of GM Yip's Ving Tsun. In addition, probably many did not receive the complete system, so some parts were learned second hand or fabricated. Others may have added elements from other styles. Still others may have been entirely received from Yip Man but interpreted through the eyes and abilities of the student. And some may have actually
narrowed the focus of the style to make it even more coherent, but also more limited in scope.
I'm not asking anyone to give up their devotion to their sifu or lineage. I'm just suggesting that we show a little humility and respect for others. If someone can't do that, this forum really isn't the place for them to be posting.