My father-in-law does that with coffee. Fill a mug with milk, add two scoops of instant coffee, 60 seconds in the microwave at 800W, stir, another 10-30 seconds in the microwave, stir, drink. He won't have it any other way.
There are more teas in heaven and earth, Horatio, than are dreamt of in your philosophy.
For example Kashmiri noon chai is tea boiled in milk for about an hour with baking soda before adding ice. It is then aerated by pouring between cups to make it slightly foamy.
I'd rather just plain tea than water tea + milk, it just seems the worst of both worlds to me.