It certainly changes the flavour. With more ingredients mixed into the beverage, then the taste of the tea leaves isn't as prominent.

[ If Levi doesn't like milk, she fully respects that! ]

Milk tea took our nation by storm, though. I think it will be popular for a long time... until it becomes replaced with a new concoction. But since it is cold, and you can drink it with a straw, it is convenient to take while on the go.