Milk is used when the product is wretched!
The use of milk means that the main beverage of choice is wretched to begin with. Both coffee and tea should be had without milk. The milk is for killing the "flavor" of a wretched tea or coffee.
I roast my own coffee at home, and I grind it, then brew it and drink it black. Good coffee has an inherent sweetness to it. It isn't grossly bitter, and it gently rests on the palate. It's a nice, gentle pick-me-up,
The person who brewed tea in milk in that beast of a pot you have has never had good tea or coffee.
Tea bags, indeed!