I don't want to give feedback for such minor transactions. I just want a coffee. Why do you want to make me do actual work? Giving feedback, especially if it's supposed to be taken seriously, is work, and worse, it feels so utterly pointless. It's such a simple transaction, and this way overcomplicates it.
I had a shop too once (print, Germany, sold it after a few years) and know people owning restaurants. As far as I'm concerned, you are supposed to get your feedback from the "meta data" of your business, not involve the individual customers my making them work. Which is very unlikely to give you true and/or good data anyway. It's like asking people for what they want as "market research", which just shows a lack of understanding of how brains work and way too much believe in the rational mind theory.
I had a shop too once (print, Germany, sold it after a few years) and know people owning restaurants. As far as I'm concerned, you are supposed to get your feedback from the "meta data" of your business, not involve the individual customers my making them work. Which is very unlikely to give you true and/or good data anyway. It's like asking people for what they want as "market research", which just shows a lack of understanding of how brains work and way too much believe in the rational mind theory.