What's the purpose of the "special instructions" field while ordering?

During checkout, there is a “special instructions” field. What is its purpose? Who reads it? When is it read? What can one request there?

So far I’ve used it three times, and it had no effect all three times. (I used it to request scoops, but that’s a different matter, this post is about the field itself)

Has anyone used this field? What did you use it for? Did it work?

I put in there I wanted @TimOfficialHuel to personally deliver my Huel but it didnt happen so he must have been on holiday that day.