Who's to say the person isn't a regular at a particular coffee shop with a particular barista? Frankly, it tracks with the discussion of medication dosages, which would be weirdly personal otherwise.
Those are all people that you do have a 1:1 relationship with. For a coffee maker, even if I liked it, you don't make an appointment with Barista Brandi.
You're right. They definitely should have taken the time to type out "The individual working at the coffee shop who filled my order" to avoid triggering people who have nothing better to do than get angry at the internet.