This is a true muddling of flavors, difficult to nail down exactly what it is, aside from tasty.
The blueberry combo here has Bilberry adding more of the fleshy, more "true" blueberry notes, while FW is almost syrupy, vaguely candied berries. the combination doesn't have a truly dry element to it and leans more toward the sweeter side of what makes blueberries so tasty.
The peach combo was put together as an effort to build more body off of the delicate nature of white peach, while helping pare down the harshness of the peach juicy.
The magic here though is really all on the Pitaya. INW's dragonfruit is sort of hard to pin down, not the emulsification agent that TFA dragonfruit is, and more of a real fruit flavor. It's a potent one, and it sort of turns things in a unique direction here.
The ws-23 is pretty obvious, adding a refreshing chill and really makes this a more spring and summer mix than anything else.
a light splash of cream in a hot cup of black tea with dried blueberries.
The FA Black tea works as a slightly astringent black tea, almost as though it were steeped just a bit too long.
That's where the creams come in though, helping to bury that astringent note and fill out the body of the tea. Originally the recipe called for twice as much of each cream, but that will lend itself to a faint sour note from the sweet cream. dialing them both back by half left the tea to stand up on its own, while still burying that astringency.
The blueberry combo used here is more "earthy" and marries well into the tea. Not a shock of bold fresh blueberries, but instead more of the dried berry you'd see in an herbal tea.