Is it true that you guys have never drunk milk tea & idea of milk in tea is horrible for you? because as an indian we guys can't imagine tea without milk in it (i am talking about majority because exception exists everywhere).
Tea in Asian (east asian specifically) exists in forms with milk and non milk. When you say milk tea, anyone from east asia will default to bubble tea as the assumption (for the most part).
A lot of tea is also consumed without milk like green and red tea. For the most part, tea exists in asian restaurants to pair with food more easily rather than having something with milk to compliment it. You need something to cleanse your pallete, and milk tea does not do that.