Mother nature knows better. In making cheese, the curds become the cheese. Whey's main components are bovine serum albumin and lactalbumin. There are other hormones contained in whey. Everything gets concentrated.
Steroid hormones survive, as do dioxin's and antibiotics.
Each of those hormones and proteins acts differently and has different rates of degradation. Humans milk is for humans. Cow's milk is for calves. You have no more need of cow's milk than you do rats milk, horses milk or elephant's milk. Cow's milk is a high fat fluid exquisitely designed to turn a 65 lb baby calf into a 400 lb cow.