But you don't have to do any of that to actually drink that milk, get nutricients and be fine. Two of these are basically matter of preference. And "people deep in the past", whatever what it means, would want to eat fat with all its calories and all that.

And pasteurization makes it safer, but is not necessary strictly speaking. I can even still buy unpasteurized milk - but it is more expensive due to higher hygiene requirements currently. But in the past, they would just drink it (and get sick occasionally).