Dear Neville,
What is stam halacha decided by other than precedent?
And your incorrect about what chalav yisroel meant throughout history. There were many different ways of going about it. The Gemara wasn’t invented in Europe. I’m not moving the goalposts. Your kicking the ball through endless fields thinking that there has to be a goal at the end of the next one.
My apologies that learning the real sugya doesn’t conform to your preconceived notions of halacha.