Vanilla Flavor Boost?

Just out of curiosity, what’s the thought behind the Vanilla flavor boost? Is it formulated to make U/U taste kind of like Vanilla Huel? Or is the idea to add more of a vanilla boost to vanilla Huel?

I suspect that most people add the boosts to Vanilla Huel, but i’d be interested to hear if it’s common to flavor U/U that way as well.