How on earth can cow's milk be considered an essential part of our diet when its purpose is to feed calves until they are old enough to be weaned? How does it make any sense at all that people are supposed to have it? Just because we have been doing it for centuries does not mean it is rational or good for us; it just means it was an available food source at some point, and has since become an acceptable part of the human diet.
Being a Yorkshire Lass I was raised on a cup of builders tea, preferably Yorkshire Tea, as part of my daily life. In my youth I found coffee too earthy and bitter. As I grew into adulthood and became introduced to milky, hot, frothy coffee I didn't end my relationship with tea but in fact added in a new relationship with coffee.