i suppose cow milk does dull the flavor of coffee. it tastes more like milk with coffee than coffee with milk.

personally that's what i want, but coffee is a plant and oats kind of look like coffee beans so maybe you're on to something.

maybe some day you will start roasting oats before making milk out of them to use with coffee.

and i suppose you can always add cream and whey protein to your oat milk to make it less watery.