I remember such a scenario of conversation:
A: Do you add milk in tea?
B: No serious tea drinker would add milk in tea.
Me (intimidated): I absolutely won't add milk in tea! I only add tea to milk
Jokes aside, I used to think it was impossible to drink tea in the morning (with an empty and sleepy stomach) and thought Brits and Americans must have very strong stomach, as there are so many "breakfast" black teas. But after I learned to add milk in black tea, I enjoy black tea during breakfast from time to time.
I also suspect that I tend to add milk to tea containing high content of anthocyanin - a source of both floral aroma and astringency, such as some Indian black teas and Red Ruby from Taiwan. The latter one is quite expensive so I don't drink it often. But generally I feel a lot of Indian black teas, Kenyan black teas and Chinese hei cha, when mixed with milk, would yield unique flavors that wouldn't be found in the absence of milk.