Update! For this who like milkier/richer milk teas, definitely try the half and half option! Before I tried this I thought that it might give the milk tea a strange taste, since half and half is so distinct. However, it blended in quite well and didn't have any strange taste/aftertaste at all! This will probably be my go-to option for milk teas here from now on.
As for fruit-flavored tea (without milk), I found them to use quite a bit of syrup for the small size. I got a Passionfruit Green Tea with Lychee Jelly. The passionfruit flavor was pretty strong, and made it quite sweet even though I got 'light sweetness'. My friend got a large Lychee Black Tea and the syrup taste was not as strong in his. I'm thinking this is probably because he got a large and it was more evenly distributed? The lychee jelly was on point though! Pretty sure most places get the same lychee jelly anyways.