Though I did not follow the idea of chunkier fruit in those travel milkshakes, isn't that what clogs the straw, which is not ideal for a 1-hand treat.

The article presents the fruit as a way to make the milkshake more "interesting", addressing the fact that existing customers were purchasing milkshakes in part to make their commute less boring.

Weirdly, there's no followup on whether the changes improved sales, margins, or other goals.