The more basic question is Do we really need milk in this day and age?
Discussion
Of course we do
Why? What nutrition does milk give you that other sources don’t ? It’s mostly cultural at this point
Do we really need cookies in this day and age? What nutrition do cookies give you that other sources don't? Are these dumb questions?
Cookies are fun food. Do we need? Nope. Do we want, yep.
Same goes for milk. Do we need? Nope. Do we want? Upto you.
Subtle difference. Makes a huge difference.
There is no pro or contra milk unless it's an individual health issue or - like in some countries - your body has a genetic issue with lactose.